Agreeable Ageratum: A Comprehensive Guide to Growing Your Blue Bloomin’ Buddy

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Welcome to the ultimate guide to growing Ageratum (Ageratum houstonianum), the cheerful and hardy annual plant that’s perfect for adding color and texture to your garden or window boxes. From seed starting to caring for mature plants, we’ll cover all the tips and tricks you need to cultivate a thriving and beautiful Ageratum patch. Let’s get planting!

Benefits of Growing Your Own Ageratum (Ageratum houstonianum)


Benefits of growing Ageratum at home:

  • Attracts pollinators such as butterflies and bees to your garden
  • Produces fluffy, long-lasting blooms in shades of blue, pink, and white
  • Tolerates heat and drought well, making it a low-maintenance option
  • Can be grown in containers, making it suitable for small spaces and balconies
  • Has a unique fragrance that can repel mosquitoes and other insects

General Information About Ageratum (Ageratum houstonianum)

Plant Family: Asteraceae (also known as the daisy family)
Plant Latin Name: Ageratum houstonianum

Plant Variations Available

Ageratum, also known as Ageratum houstonianum, is an annual herb native to Mexico and Central America. This plant is a popular choice for gardeners, as it produces a profusion of dainty, fluffy flowers in shades of blue, pink, and white.

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One of the unique characteristics of Ageratum is its ability to grow in a variety of soil types, although it does prefer well-draining soil that is rich in organic matter. It also requires full sun to partial shade and regular watering to thrive.

There are many different varieties of Ageratum available, each with their own unique characteristics. The most popular cultivar is the Blue Mink, which produces soft, powder blue flowers in large clusters. Other notable varieties include the Hawaii series, which features bright, bold colors, and the Swan series, which produces large, fluffy flowers in shades of pink and white.

Although Ageratum is generally a hardy and low-maintenance plant, it is susceptible to some common garden pests and diseases, including powdery mildew and spider mites. To prevent these issues, it is important to keep the plant well-watered, maintain proper air circulation, and remove any infected leaves as soon as they are noticed.

Overall, Ageratum is a lovely choice for adding color and texture to your garden or landscape. With its wide range of varieties and easy-to-grow nature, it is sure to be a crowd-pleaser for years to come.

Germinating Ageratum (Ageratum houstonianum)

Preferred Zones

If you’re looking to grow Ageratum, you’ll be pleased to know that it’s a relatively easy plant to care for. When it comes to outdoor growing, there are a few different zones that are best suited to this lovely flower.

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If you live in USDA hardiness zones 8 or above, you’ll have the best luck growing Ageratum. These zones are warmer and offer ideal conditions for this type of plant. However, with a little extra care, you may be able to grow Ageratum in zones as low as 6 or 7.

When it comes to planting your Ageratum, you’ll want to choose an area with full sun to partial shade. This flower prefers well-draining soil, so make sure to choose a spot with good drainage. If your soil is heavy or clay-like, you can amend it with sand or other organic matter.

Watering is key when it comes to growing Ageratum. It’s important to keep the soil moist, but not overly wet. You’ll want to water your plants regularly, but be careful not to water them too much. Ageratum is susceptible to root rot, so it’s best to err on the side of caution.

When it comes to pests and diseases, Ageratum is relatively hardy. However, it can be susceptible to fungal infections in humid climates. To prevent this, make sure your plants have good air circulation and avoid overhead watering.

Overall, Ageratum is a lovely plant that can add color and interest to any garden. With the proper care and attention, you can enjoy these delicate flowers for years to come!

Sowing Instructions

When it comes to sowing Ageratum (Ageratum houstonianum), there are a few important things to keep in mind in order to have the most success. Here are the best methods and procedures:

1. Timing: The ideal time to sow Ageratum seeds is in the spring, after the last frost has passed. This will help ensure that the seedlings have a chance to establish themselves before the heat of summer sets in.

2. Soil preparation: Ageratum prefers a well-draining soil that is rich in organic matter. To prepare the soil for sowing, loosen it to a depth of about 6 inches and mix in some compost or other organic material.

3. Sowing: Ageratum seeds are very small, so it’s best to sow them thinly and not too deep. Scatter the seeds over the prepared soil, then cover with a thin layer of soil. Keep the soil moist but not waterlogged.

4. Light and temperature: Ageratum seeds require light to germinate, so it’s important to keep them near the surface of the soil. They also prefer warm temperatures, so it’s best to keep them in a sunny location that stays consistently above 60 degrees Fahrenheit.

5. Maintenance: Once the seedlings emerge, thin them out to about 6 inches apart to give them room to grow. Keep the soil moist, but be careful not to overwater as this can cause root rot.

With these methods and procedures, your Ageratum seeds should have the best chance of growing into healthy, vibrant plants that will add color and beauty to your garden.

Preparation Advice

If you’re thinking about growing Ageratum, there are a few things you’ll need to keep in mind before getting started. Here are a few helpful tips to ensure your Ageratum grows healthy and strong:

1. Choose the Right Soil: Ageratum thrives in well-draining soil with a pH range of 6.0-7.0. Make sure the soil is fertile and nutrient-rich to promote healthy growth.

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2. Seed Starting: Ageratum can be propagated by seed indoors, 4-6 weeks before the last expected frost of the season. Make sure to keep the soil moist, but not waterlogged, and provide plenty of bright light.

3. Transplanting: Once your seedlings are established, it’s time to transplant them into the garden. Make sure to choose a sunny spot as Ageratum requires at least 6 hours of sunlight per day to grow to its full potential.

4. Fertilizer: Ageratum thrives on regular fertilization, so make sure to feed your plants with a balanced fertilizer periodically during the growing season.

5. Watering: Water your Ageratum deeply and regularly, making sure to avoid waterlogged soil. Ageratum plants are prone to root rot, so it’s important to maintain a consistent watering schedule.

6. Pruning: Regular pruning is essential to keep Ageratum plants from becoming too leggy or sprawling. Prune back any dead or damaged branches and pinch back any new growth to promote bushy growth.

7. Pest Control: Ageratum is relatively pest and disease-resistant, but keep an eye out for aphids, spider mites, and powdery mildew. Use a mild insecticidal soap or fungicide as needed to keep your plants healthy.

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As for equipment, you don’t need anything too fancy or specialized to grow Ageratum successfully. However, a few gardening basics like a trowel, gloves, watering can, and a good pair of pruning shears will come in handy.

With just a bit of patience, care, and attention, you can enjoy a vibrant and healthy Ageratum garden that will last for many years to come. Happy growing!

Germination Tools and Equipment

Germinating Ageratum (Ageratum houstonianum) requires some specific tools and equipment to achieve healthy and robust plants. Here are some of the best tools and equipment you need for successful germination:

1. Seed Starting Tray – A plastic or biodegradable seed starting tray with lots of holes is crucial for germinating Ageratum. It provides the ideal environment for seeds to sprout and grow.

2. Potting Mix – A good-quality potting mix is essential for healthy germination. It should be well-draining and contain a nutrient-rich soil blend, peat moss, and perlite or vermiculite.

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3. Grow Light – Ageratum requires plenty of light to grow healthy and strong. Invest in a high-quality grow light or position your seedlings in a sunny window with at least 6 hours of direct sunlight.

4. Heat Mat – This tool regulates the temperature of your seedlings, providing optimal growing conditions for Ageratum seeds. The ideal temperature for germination is around 70°F to 75°F.

5. Fertilizer – Providing nutrients for your seedlings is essential for healthy growth. Use a water-soluble fertilizer designed for seedlings, and always follow the recommended dosage on the package.

6. Watering Can – Ensure that your seedlings receive enough water to keep the soil moist but not waterlogged. A watering can with a spout is the best choice to prevent overwatering.

With these tools and equipment, you should be well equipped to germinate healthy and robust Ageratum plants. Remember to follow the instructions on your seed packet, and soon enough, you will have beautiful, blooming Ageratum flowers.

Growing Ageratum (Ageratum houstonianum)


Light Requirements

If you’re looking to grow Ageratum (also known as flossflower) indoors or in low-light conditions, it’s important to consider the lighting requirements for this plant to thrive. Ageratum is classified as a full sun to partial shade plant, which means it needs at least 6 hours of direct sunlight per day to grow healthy.

If you’re growing Ageratum indoors, it’s important to place it near a bright window that receives at least 6 hours of sunlight daily. Ageratum is not particularly picky when it comes to light quality, but it thrives in bright, indirect light. Artificial light sources can also be used if natural light is insufficient. LED grow lights are a popular choice among indoor gardeners, as they provide the necessary spectrum of light for healthy plant growth.

When growing Ageratum outside, be sure to plant it in a location that receives at least 6 hours of direct sunlight per day. If you live in a particularly hot or dry climate, consider providing some shade during the hottest parts of the day to prevent the plant from becoming stressed.

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In summary, if you want to grow healthy and beautiful Ageratum, make sure to provide it with at least 6 hours of direct sunlight per day, whether it’s through natural or artificial light sources. Ageratum is a relatively low-maintenance plant, but providing it with the right lighting conditions will greatly enhance its growth and overall health.

Temperature Requirements

Ageratum is a beautiful annual plant that boasts lovely fluffy blue, pink, and white flowers. This plant thrives in warm, sunny weather and requires specific temperature requirements to stay healthy.

For Ageratum to prosper and bloom beautifully, temperatures between 60-80°F (15.5-27°C) are ideal. This range is perfect for Ageratum because the plant doesn’t like to stay in excessively cold or hot temperatures for long periods. If the thermometer dips below 50°F (10°C), the plant may start to wilt or die, so make sure to plant Ageratum in a warm area.

Additionally, Ageratum requires warmth during its germination stage. When starting from seeds, carefully choose a time when soil temperature is between 65-70°F (18-21°C), which is approximately a week or two after the last frost date.

During the summer months, Ageratum needs regular watering so that it does not dry out in the heat, thereby adversely affecting its growth. If your area experiences extreme heat, consider using mulch to help keep the roots cool.

In conclusion, Ageratum enjoys a warm and mild climate that is neither too hot nor too cold. This plant needs specific temperature requirements to flourish but with proper care and attention, it can bloom into a beautiful addition to your garden or landscape.

My Favorite Tools For Growing Ageratum (Ageratum houstonianum)

Ageratum plants are beautiful additions to any garden, but they do require a little bit of TLC to thrive. Luckily, with the right tools and equipment, caring for your Ageratum plants can be a breeze.

Here are the top tools and equipment you’ll need for maintaining healthy Ageratum:

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1. A good pair of pruning shears: Ageratum plants benefit from regular pruning to encourage bushier growth and prevent legginess. Invest in a pair of sharp pruning shears to make clean cuts and prevent damage to the plant.

2. A watering can: Ageratum plants prefer consistently moist soil, so a watering can is a must-have tool for keeping them hydrated. Water your plants deeply once a week or more often if the soil feels dry to the touch.

3. High-quality potting soil: Whether you’re planting your Ageratum in a container or in the ground, it’s important to use high-quality potting soil with good drainage. Ageratum plants are prone to root rot if their roots sit in waterlogged soil, so choose a well-draining mix that will allow excess water to flow away from the roots.

4. Fertilizer: Ageratum plants benefit from regular fertilization to encourage healthy growth and vibrant blooms. Choose a balanced, water-soluble fertilizer and apply according to the package instructions.

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5. Mulch: Ageratum plants appreciate a layer of mulch around their base to help retain moisture and suppress weeds. Choose a natural mulch like shredded bark or leaves, and apply a layer about 2-3 inches thick.

By using these tools and equipment, you can keep your Ageratum plants healthy and thriving all season long. With a little bit of care and attention, you’ll be rewarded with an abundance of beautiful and vibrant blooms.

Preferred Soil Type

In order to grow healthy and vibrant Ageratum, it is important to pay attention to the soil quality in which it is planted. These lovely flowers require a well-draining soil with a neutral pH of around 6.5 to 7.0. This allows for optimal nutrient uptake and ensures that the roots are not sitting in water, which can cause root rot and other fungal issues.

Ageratum thrives in soil that is rich in organic matter. Adding compost or well-rotted manure to the soil before planting will give the plants a nutritional boost and help retain moisture in the soil. It is also recommended to add a slow-release fertilizer to the soil before planting to ensure that the plants have access to the nutrients they need throughout the growing season.

When planting Ageratum, make sure to space them out correctly to ensure adequate air flow and prevent overcrowding. This will help prevent disease and other issues that can arise when plants are too close together.

Regular watering is important to keep Ageratum healthy and thriving. Make sure to water deeply, but not too often, as this can lead to fungus and disease problems. Aim to water the plants about once a week or when the soil feels dry to the touch.

Overall, with the right soil conditions and care, Ageratum can provide a stunning burst of color to any garden or landscape.

Watering Requirements

If you’re looking to grow healthy Ageratum, it’s important to understand their watering requirements. Generally, Ageratum plants are quite tolerant of dry conditions, though they do need consistent moisture to thrive.

When planting your Ageratum, be sure to give them a good watering to help establish their roots. After that, you should aim to water your Ageratum every few days or so, depending on the weather conditions. In hot, dry weather you may need to water more frequently, but in cooler, more humid conditions you can likely get away with less frequent watering.

When you do water your Ageratum, make sure to give them a deep, thorough watering rather than a light sprinkling. This will help the water reach the roots of the plant and promote healthy growth. It’s also important to avoid getting water on the leaves of the plant, as this can increase the risk of fungal diseases.

Finally, it’s a good idea to water your Ageratum in the morning or early afternoon rather than in the evening, as this will give the plants a chance to dry off before cooler temperatures set in. With the right amount of water and attention, you can help your Ageratum plants thrive and flourish.

What You Need To Know About Fertilizing Ageratum (Ageratum houstonianum)

If you’re interested in growing Ageratum, also known as Mexican ageratum or flossflower, you’ll need to be familiar with their fertilizing requirements for optimal plant health.

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Ageratum plants thrive in fertile soil that is well-draining, moist, and rich in organic matter. Before planting, it’s recommended to amend your soil with compost or a slow-release fertilizer to provide your Ageratum with the necessary nutrients it needs to grow strong and healthy.

Once your Ageratum plants are established, you can supplement their soil with additional fertilizers throughout the growing season. A balanced, water-soluble fertilizer can be applied every two weeks during the mid to late summer months to promote healthy growth and vibrant blooms.

Be sure to follow the manufacturer’s instructions for the correct application rate and avoid over-fertilizing, which can damage your plants and create burned or yellowed foliage.

Alternatively, you can also use organic fertilizers such as fish emulsion or worm castings to supply your Ageratum with the necessary nutrients it needs to thrive. These natural fertilizers provide a slow, steady source of nutrients that your plants can absorb over time.

Remember to water your Ageratum plants regularly, as well as provide them with adequate sunlight and good air circulation to keep them healthy and happy. With proper fertilizing and care, your Ageratum plants can flourish and provide a beautiful burst of color to your garden or landscape.

My Favorite Fertilizers For Ageratum (Ageratum houstonianum)

When it comes to growing Ageratum, fertilization is an essential aspect that you shouldn’t overlook. A balanced fertilizer will provide your Ageratum with the necessary nutrients it needs to thrive and bloom.

The best fertilizer for Ageratum should have a balanced nutrient ratio, meaning it should contain equal amounts of nitrogen, phosphorus, and potassium (N-P-K). Nitrogen is crucial for leaf development and growth, phosphorus enhances root growth and flower production, while potassium helps the plant survive and resist disease.

We recommend using a slow-release fertilizer with an N-P-K ratio of 10-10-10 or 14-14-14. Alternatively, you can use an organic fertilizer such as compost or well-rotted manure to provide your Ageratum with the necessary nutrients.

When fertilizing your Ageratum, ensure you follow the instructions on the package or the guidelines specified for the organic fertilizer. Over-fertilization can lead to burnt leaves, stunted growth and can be harmful to your plant.

As a rule of thumb, fertilize your Ageratum every four to six weeks during the growing season. However, you can reduce the frequency during the cooler months when the plant’s growth rate slows down.

In conclusion, fertilizing your Ageratum is essential to keep it healthy and blooming. Choose a balanced fertilizer or organic compost or manure, follow the instructions carefully, and fertilize regularly to keep your Ageratum in top shape.

Harvesting Ageratum (Ageratum houstonianum)

Time To Maturity

The Ageratum plant, also known as Ageratum houstonianum, can take anywhere from 6 to 12 weeks to go from sprouting to maturity, depending on various factors. Its growth rate is affected by temperature, humidity, water, sunlight, and soil fertility.

To begin with, germination usually takes around 7 to 14 days for Ageratum seeds to sprout. However, the optimal germination temperature for Ageratum ranges from 78-82°F (25-28°C), so keep this in mind if you’re eager to see growth soon. Once the plants develop their first true leaves, they can be transplanted into a larger container or into a garden bed.

As the Ageratum plants grow, they require consistent watering and an adequate level of humidity, as they tend to dry out quickly. Ageratum plants are also sun-lovers and require at least six hours of direct sunlight each day for proper development. Keep in mind that too much shade can cause stunted growth, while too much sunlight can scorch the plant.

With the right conditions, Ageratum plants will flower in approximately 10-12 weeks after germination. However, it’s important to note that the maturity of Ageratum plants varies based on the specific cultivar, so be sure to research the type of Ageratum you have to get a better understanding of its growth habits.

In conclusion, growing Ageratum from sprouting to maturity requires patience, proper environmental conditions, and basic plant care skills. With a nurturing touch and a bit of time, you’ll be rewarded with charming, blue, lavender or white flowers.

Harvest Instructions

Harvesting Ageratum: A Helpful Guide

If you’re a fan of vibrant blue flowers, you may be cultivating Ageratum houstonianum in your garden. Known for its ability to brighten up both indoor and outdoor spaces, Ageratum is a beloved addition to many floral arrangements. However, if you want your Ageratum to offer premium blooms, you must learn to harvest them correctly. In this detailed guide, we’ll give you all the information you need to know to harvest your Ageratum!

Timing is Key

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First things first- timing is crucial when it comes to harvesting Ageratum. If you want your flowers to have a long vase life, cut them before they reach full bloom. At this stage, the flowers will have just opened, and the color will be rich and vibrant. Waiting until the blooms are fully open can result in a shorter vase life and a less striking visual appearance.

Use Clean, Sharp Tools

Before you begin, ensure your tools are clean and sharp. Clean your scissors or pruning shears with a disinfectant solution to prevent the spread of bacterial or fungal disease. Dull tools can create jagged edges, which can lead to the flowers experiencing distress.

Cutting the Stems

When cutting the Ageratum stems, ensure you cut them as close to the base as possible. This will ensure the plant doesn’t get damaged in the process. Place the cutting in a bucket of water, and after you’ve collected all the stems you want, immediately transport them to the place where you intend to arrange them.

Make a Clean Cut

The next step is to cut the stems once again, ensuring that you use sharp, clean tools. Cut the stems at a slant under running water if possible, which will allow the flower to absorb water better, and help prevent air that might clog the stem.

Conditioning Ageratum

After cutting, to ensure the Ageratum has a decent lifespan, condition the flowers. Conditioning is the process of prolonging the vase life of cut flowers by giving them nutrients, removing foliage below the waterline, and allowing them to rehydrate before making the floral arrangement. To condition Ageratum, remove any leaves that will fall under the waterline and create a bacteria-infected condition. Cut the stems under running water to prevent air from entering the plant. The flowers should be submerged in a solution of water and flower food, also called flower preservative solution.

Final Thoughts

My Favorite Tools For Harvest Time

When it comes to harvesting Ageratum (Ageratum houstonianum), having the proper tools and equipment can make all the difference. Here are a few of the best tools to help you successfully harvest your Ageratum:

1. Pruning Shears: A good pair of pruning shears will make harvesting your Ageratum a breeze. Look for shears that are sharp and durable, as you’ll need to make precise cuts to avoid damaging the plant.

2. Harvesting Knife: A harvesting knife is especially useful if you’re dealing with a large crop of Ageratum. Look for a knife with a sharp, curved blade and a comfortable grip.

3. Harvesting Basket or Apron: It’s important to have a way to easily carry your harvested Ageratum while you’re out in the field. A large, sturdy basket or an apron with pockets is a great option.

4. Gloves: A pair of gloves will protect your hands from any thorns or prickly stems while you’re harvesting your Ageratum.

5. Watering Can or Hose: Keeping your Ageratum hydrated is important, especially during hot and dry weather. A watering can or hose will make it easy to give your plants a good drink after harvesting.

When it comes to harvesting Ageratum, having the right tools and equipment can make all the difference. With a little bit of planning and preparation, you’ll be able to harvest your Ageratum crop with ease. Happy harvesting!

End of Season & Overwintering


As the cool fall weather starts to set in, it’s time to start thinking about your end of season care for your beautiful Ageratum plants. These lovely annuals have likely been providing you with a burst of colorful blooms throughout the growing season, but they won’t survive the frosty winter months without a little extra attention. So, what steps do you need to take to help your Ageratum make it through the winter?

First and foremost, it’s important to understand that Ageratums are not frost-tolerant. That means that if their roots are exposed to temperatures below 32 degrees Fahrenheit, they are at risk of dying. So, your first priority is to bring your Ageratum plants indoors before the frost sets in. This can be done either by digging them up and transplanting them in pots, or by taking cuttings of the plant and rooting them in a water or soil medium inside. Make sure to water the plants well before you move them, as this will help them withstand the transition.

Once indoors, your Ageratums will still need proper care to stay healthy. Keep them in a bright room with plenty of sunlight, and make sure to water them regularly. You may also want to mist them occasionally, as indoor air can be quite dry during the winter months.

If you choose to leave your Ageratums outside and unprotected, you’ll need to take additional steps to ensure their survival. Cover them with a thick layer of mulch or hay to insulate their roots from the cold. You may also want to wrap burlap or another protective material around the plants, especially if you live in an area that gets particularly cold or windy during the winter.

No matter how you choose to care for your Ageratums during the winter months, the most important thing is to keep a close eye on them and make adjustments as needed. By giving your plants the proper care they need, you can help ensure they come back strong and colorful next year.

Final Thoughts on Ageratum (Ageratum houstonianum)


Congratulations – you have successfully completed the journey of germinating, growing, and harvesting Ageratum! With just a little bit of TLC, you have cultivated beautiful blooms that will bring life and color to any garden. Whether you are a beginner or a seasoned gardener, the steps laid out in this guide should have given you the knowledge and confidence needed to successfully grow Ageratum.

By following the careful instructions on germinating Ageratum seeds, providing adequate light and moisture during growth, and harvesting at the optimal time, you will have no problem producing healthy plants that are sure to impress. Remember, each step in the process is crucial to the overall success of your plants. From planting to harvesting, Ageratum requires consistent care and attention.

As you admire your beautiful Ageratum blooms, take a moment to reflect on the journey that you and your plants have been through. From the tiny seed to the spectacular blossom, each stage has its own unique beauty and challenges. And with a little bit of patience and perseverance, you have produced a beautiful and rewarding addition to your garden.

So go ahead and enjoy the fruits of your labor – take some time to sit back and appreciate the beauty that you have created. And when the growing season comes around again, remember the steps outlined in this guide to ensure that your Ageratum plants continue to thrive year after year. Happy gardening!

Frequently Asked Questions About Growing Ageratum (Ageratum houstonianum)


Q: What is the ideal soil type for growing Ageratum?
A: Ageratum grows best in well-draining soil that is moist and fertile. It prefers a pH range of 6.0 to 7.0, so you may want to amend your soil with compost to achieve these levels.

Q: How do I care for my Ageratum as it grows?
A: Ageratum requires regular watering, especially during dry spells. It benefits from regular fertilization, which can be accomplished with a balanced fertilizer every three to four weeks. Deadheading spent blooms will encourage continued flowering throughout the growing season.

Q: When is the best time to plant my Ageratum?
A: You can plant Ageratum as soon as the soil has warmed up in the springtime. In warmer climates, it can also be planted in the fall. It is important to remember that this plant is frost-sensitive and will not survive frosty temperatures.

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