How To Plant Crocosmia [ Full Guide ]

Crocosmia, also known as montbretia, is a stunning perennial plant adored for its brilliant, funnel-shaped flowers that add vibrant color to gardens and landscapes. Originating from South Africa, these plants are relatively easy to grow and require minimal maintenance once established. If you’re looking to add a pop of color, texture, and height to your garden, crocosmia may be the perfect addition. This article will provide a comprehensive guide on how to plant crocosmia, from selecting the ideal planting location to preparing the soil and planting the bulbs.

Quick Answer: How To Plant Crocosmia

Before delving into the detailed steps, here’s a quick overview of the process of planting crocosmia:

  1. Choosing a Planting Location: Select a site with full sun to partial shade and well-draining soil.
  2. Soil Preparation: Prepare the soil by loosening it and adding organic matter for improved drainage and fertility.
  3. Planting Crocosmia Bulbs: Plant crocosmia bulbs at the right depth and spacing, ensuring they are positioned correctly to encourage healthy growth.
  4. Watering and Maintenance: Water the bulbs thoroughly after planting, and follow up with regular watering and care as they establish and grow.

Now, let’s delve into the detailed steps for each stage of planting crocosmia.

Choosing A Planting Location

Crocosmia thrives in locations that receive ample sunlight, ideally 6 to 8 hours of direct sunlight per day. However, they can also tolerate partial shade, making them versatile for different garden settings. When selecting a planting location for crocosmia, consider the following factors:


Choose a spot that receives sufficient sunlight to encourage strong, healthy growth and prolific flowering. In regions with intense summer heat, providing some afternoon shade can help protect the plants from scorching.

Soil Drainage

Crocosmia plants prefer well-draining soil to prevent waterlogged conditions that can lead to root rot. Avoid areas with compacted or water-retentive soil, as this can cause issues for the plants.

Space And Height

Consider the mature size of the crocosmia variety you’re planting. Some larger varieties may require additional space and support, while smaller varieties can be nestled into garden borders or containers.


Crocosmia generally prefer mild to warm climates. While they can tolerate some cold, they may not thrive in regions with prolonged frost or extremely low temperatures. Consider the local climate and whether it aligns with the plant’s requirements.

Once you’ve identified a suitable location that meets these criteria, you can proceed with preparing the soil for planting.

Soil Preparation

Proper soil preparation is essential for ensuring the best possible growing conditions for crocosmia. The following steps will guide you through the process of preparing the soil for planting these vibrant perennials.

Loosening The Soil

Before planting, it’s crucial to loosen the soil to a depth of at least 8 to 10 inches. This allows for better root penetration and helps prevent soil compaction, which can hinder growth. Use a shovel or garden fork to gently turn over the soil, breaking up any large clumps and removing debris such as rocks or roots.

Adding Organic Matter

Incorporating organic matter, such as compost or well-rotted manure, into the soil can improve its structure, fertility, and drainage. Spread a layer of organic matter over the loosened soil and mix it in thoroughly. Aim to achieve a balanced, friable soil texture that retains moisture without becoming waterlogged.

Adjusting Ph If Necessary

Crocosmia generally prefer slightly acidic to neutral soil with a pH range of 6.0 to 7.0. If your soil’s pH deviates significantly from this range, you may consider adjusting it by incorporating amendments or using pH-adjusting products available at garden centers.

Soil Testing

If you’re uncertain about your soil’s composition, conducting a soil test can provide valuable insights into its nutrient levels and pH. Many agricultural extension offices or garden centers offer soil testing services, enabling you to make informed decisions about soil amendments.

By taking these steps to prepare the soil, you can create an optimal growing environment for crocosmia, setting the stage for healthy and vigorous growth.

Planting Crocosmia Bulbs

With the soil prepared, it’s time to plant the crocosmia bulbs. Follow the steps below to ensure that the bulbs are planted at the correct depth and spacing, setting the stage for successful establishment and blooming.


Plant crocosmia bulbs in the spring, after the threat of frost has passed and the soil has begun to warm. This timing allows the bulbs to establish roots and acclimate to their new environment before the onset of summer.

Bulb Selection

When purchasing crocosmia bulbs, choose healthy, firm bulbs free from signs of decay or damage. Larger bulbs typically produce stronger plants with more robust blooms.

Planting Depth

Dig holes for the crocosmia bulbs approximately 3 to 4 inches deep, spacing them 6 to 8 inches apart. This spacing allows the plants to have sufficient room to grow and prevents overcrowding, which can lead to competition for resources.

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Place the bulbs in the holes with the pointed ends facing upward. Ensuring the correct orientation of the bulbs will encourage them to emerge from the soil and grow in the right direction.

Covering And Watering

Gently backfill the holes with soil, ensuring that the bulbs are adequately covered. Water the newly planted bulbs thoroughly to settle the soil and provide essential moisture as they begin the growth process.


Applying a layer of organic mulch, such as shredded bark or compost, around the planted bulbs can help conserve soil moisture, suppress weed growth, and moderate soil temperature. Leave a small gap around the base of each plant to prevent moisture-related issues.

Planting crocosmia can be a rewarding endeavor, adding an explosion of color and elegance to your garden or landscape. By carefully selecting a suitable planting location, preparing the soil with proper amendments, and planting the bulbs at the correct depth and spacing, you set the stage for healthy growth and vibrant blooms. Remember to provide adequate water and ongoing care as the plants establish and flourish. With the right conditions in place, your crocosmia plants are sure to brighten your outdoor space with their showy, graceful presence.

Watering And Fertilizing

Crocosmia, also known as Montbretia, is a genus of flowering plants that is native to Africa. These plants are loved for their vibrant and showy flowers, which can range in color from shades of red, orange, and yellow. Crocosmia plants are relatively easy to grow and can make a stunning addition to any garden or landscape.

Crocosmia plants are fairly drought-tolerant, but they still require regular watering, especially during dry spells. It is important to keep the soil evenly moist, but not waterlogged. Overwatering can lead to root rot and other problems, so it’s essential to strike a balance.

During the hot summer months, it’s a good idea to provide your crocosmia plants with a deep watering once or twice a week. This allows the water to penetrate deeply into the soil, encouraging healthy root development. If you’re in an area with high rainfall, you may not need to water as often, but keep an eye on the soil moisture to ensure it doesn’t become too dry.

When it comes to fertilizing crocosmia plants, they are relatively low-maintenance. A general-purpose balanced fertilizer, such as a 10-10-10 or 14-14-14, can be applied in early spring when new growth appears. Follow the instructions on the fertilizer packaging for the appropriate dilution and application rate.


Mulching can be beneficial for crocosmia plants in several ways. It helps retain moisture in the soil, suppresses weeds, and regulates soil temperature. Organic mulches, such as compost, straw, or wood chips, are ideal for crocosmia plants as they provide additional nutrients to the soil as they break down.

Apply a layer of mulch around the base of your crocosmia plants, leaving a small gap around the stem to prevent moisture buildup and potential rotting. Aim for a thickness of around 2-3 inches, taking care not to pile the mulch directly against the stem.

Mulch should be added in early spring when the soil is moist, and the ground has warmed up. This will help to conserve soil moisture during hot summer months and protect the plant’s roots during winter.

Pruning And Deadheading

Pruning and deadheading are essential maintenance tasks for crocosmia plants to keep them healthy and encourage continuous blooming. Deadheading refers to the removal of spent flowers, while pruning involves cutting back the foliage.

Deadheading should be done regularly throughout the blooming season to prevent the plant from expending energy on producing seeds. Simply take hold of the faded flower stalks and cut them back to the base of the plant. This encourages the plant to redirect its energy into producing new flowers, resulting in a longer blooming period.

Pruning is typically done in late fall or early spring. Cut back the foliage to a few inches above the ground, removing any dead or damaged leaves. This helps to keep the plant tidy and promotes healthy growth in the following season.

Pest And Disease Control

Crocosmia plants are generally resistant to most pests and diseases. However, they can occasionally be affected by certain problems. Here are some common pests and diseases to watch out for and tips on managing them:

Aphids: Aphids are small, sap-sucking insects that can infest crocosmia plants. They can be controlled by simply spraying the plants with a strong jet of water to dislodge them. Alternatively, neem oil or insecticidal soap can be used to control severe infestations.

Slugs and Snails: These pests can be particularly damaging to crocosmia plants, as they feed on the foliage and flowers. Manual removal or using slug and snail repellents can help control their populations.

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Root Rot: Overwatering or poorly drained soil can lead to root rot. To prevent this, ensure the soil is well-drained and avoid overwatering. If root rot is detected, it may be necessary to remove the affected plant and replace it with a new one.

Fungal Diseases: Crocosmia plants can be susceptible to fungal diseases such as rust and leaf spot. Avoid overhead watering, as damp foliage encourages these diseases. If fungal infections occur, infected plant material should be promptly removed and destroyed. Fungicides may also be used as a preventive measure or as a last resort.

Planting crocosmia can be a rewarding experience, as these beautiful flowers add a splash of vibrant color to your garden. By following the guidelines outlined in this comprehensive guide, you can ensure the success of your crocosmia plants.

Remember to water and fertilize your plants appropriately, provide mulch for moisture retention and weed suppression, and regularly prune and deadhead to encourage blooming. Keep an eye out for common pests and diseases and take appropriate measures to manage them.

With proper care, your crocosmia plants will flourish and provide you with stunning blooms year after year. Enjoy the beauty and splendor they add to your garden!

Winter Care

Crocosmia is a vibrant and stunning flowering plant that adds a touch of brilliance to gardens and landscapes. Also known as montbretia, it belongs to the Iris family and hails from South Africa. With its sword-shaped leaves and fiery blooms in shades of red, orange, and yellow, crocosmia is a popular choice among gardeners looking to create a visually striking display.

Apart from its aesthetic appeal, crocosmia is a relatively low-maintenance plant that can survive in various growing conditions.

Crocosmia is generally a hardy plant that can withstand moderate winter conditions. However, in colder regions, it is advisable to provide some protection during the dormant season. Here are some steps to ensure your crocosmia survives the winter:

  1. Mulch: Apply a layer of organic mulch around the base of the plant before the first frost. This will help insulate the soil, keeping it at a more stable temperature during the winter months.

  2. Cut back foliage: Once the plant has gone dormant and the foliage has died back, cut it back to about 2-3 inches from the ground. This prevents any potential disease or pests from overwintering on the plant.

  3. Divide and transplant: Fall is an ideal time to divide and transplant crocosmia. Lift the clumps of bulbs carefully and separate them into individual bulbs. Replant them in a suitable location or store them in a cool, dry place until spring.

  4. Pot cultivation: If you live in an area with extremely harsh winters, consider growing crocosmia in pots. This allows you to bring the plants indoors or into a greenhouse during the coldest periods.

By providing a little extra care and protection during the winter months, you can ensure the longevity and health of your crocosmia plants.

Propagation Methods

Crocosmia can be propagated through various methods, including division, bulb offsets, and seed sowing. Here’s a detailed explanation of each method:

  1. Division: The most common and straightforward method of propagating crocosmia is through division. Divide the clumps of bulbs every 3-5 years, generally during the autumn months. Carefully dig up the clump and separate the bulbs, ensuring that each division has a sufficient number of healthy bulbs and a portion of the root system. Replant the divisions at the same depth as the original plant, spacing them around 6-12 inches apart.

  2. Bulb offsets: Crocosmia bulbs produce offsets or small bulblets around the main bulb. These offsets can be detached and planted individually to create new plants. Allow the offsets to develop and mature on the parent plant until they are large enough to handle. Gently separate them from the main bulb and plant them at the same depth as the parent plant.

  3. Seed sowing: If you want to embark on a more adventurous propagation journey, you can grow crocosmia from seeds. Harvest ripe seed capsules after the flowers have faded and the capsules have turned brown. Remove the seeds from the capsules and soak them in warm water for 24 hours before sowing. Sow the seeds in pots or seed trays filled with a well-draining seed compost. Keep the soil consistently moist and provide warmth and light. Germination usually takes around 2-3 weeks. Once the seedlings have developed several sets of leaves, they can be transplanted into individual pots or directly into the garden.

Whichever method you choose, remember that crocosmia bulbs can take a few years to become fully established and produce large, robust blooms. Be patient and provide proper care to enjoy the fruits of your labor.

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Companion Planting With Crocosmia

Companion planting is the practice of growing plants together that have mutual benefits. When it comes to crocosmia, several companion plants can enhance its beauty and health. Here are some excellent choices for companion planting with crocosmia:

  1. Agapanthus: The blue or white blooms of agapanthus make a stunning contrast next to the vibrant colors of crocosmia. Both plants enjoy similar growing conditions, such as full sun and well-drained soil.

  2. Echinacea: Crocosmia’s fiery red, orange, and yellow flowers pair beautifully with the pink, purple, and white blooms of echinacea. Together, they create a visually pleasing and dynamic display in the summer garden.

  3. Ornamental grasses: Pairing crocosmia with ornamental grasses, such as Miscanthus or Pennisetum, adds texture and movement to the garden. The wispy nature of grasses complements the boldness of crocosmia blooms.

  4. Daylilies: Daylilies, with their diverse range of colors and long blooming period, make an excellent companion for crocosmia. They create a vibrant and ever-changing display throughout the summer months.

  5. Liatris: The upright, spiky blooms of liatris provide a striking contrast to the arching stems and sword-shaped leaves of crocosmia. Both flowers attract pollinators, making them a beneficial combination for a wildlife-friendly garden.

When choosing companion plants for crocosmia, consider factors such as sunlight requirements, soil conditions, and blooming periods to ensure optimal growth and compatibility.

Crocosmia Care And Maintenance

In addition to winter care, crocosmia requires regular care and maintenance throughout the growing season to thrive and produce abundant blooms. Here are some essential tips:

  1. Sunlight and soil: Crocosmia thrives in full sun but can tolerate partial shade. It prefers well-draining soil enriched with organic matter. Ensure that the planting location receives at least 6-8 hours of direct sunlight daily.

  2. Watering: Crocosmia is relatively drought-tolerant once established but benefits from regular watering during dry spells. Aim to keep the soil consistently moist, but not waterlogged, as excessive moisture can cause bulb rot.

  3. Fertilization: Apply a balanced, slow-release fertilizer in the spring when new growth emerges. This will provide the necessary nutrients for healthy foliage and blooming. Avoid over-fertilization, as it can lead to excessive foliage growth at the expense of flower production.

  4. Deadheading: To encourage continuous blooming, it’s essential to deadhead spent flowers regularly. This prevents the plant from putting energy into seed production and redirects it towards creating new blooms. Snip off the faded flower stalks just above the first set of healthy leaves.

  5. Staking: Some crocosmia varieties have tall flower stalks that may require staking to prevent them from toppling over in windy conditions. Install stakes or plant supports early in the growing season to provide adequate support without damaging the roots.

  6. Pest and disease control: Crocosmia is generally not prone to severe pest or disease problems. However, watch out for aphids, snails, and slugs. Remove any affected leaves or use organic pest control methods. Good airflow and proper plant spacing can also help prevent disease issues.

  7. Overwintering: As discussed earlier, take the necessary steps to protect crocosmia during winter, especially in colder regions. Applying mulch, cutting back foliage, and dividing or transplanting can ensure the plant’s survival and optimal growth in the following season.


With its striking blooms and relatively low maintenance requirements, crocosmia is a fantastic addition to any garden. By providing proper care and attention to factors such as winter care, propagation methods, companion planting, and general care and maintenance, you can enjoy an abundance of vibrant colors and textures throughout the growing season.


What Is The Best Time To Plant Crocosmia?

The best time to plant crocosmia is in the spring, after all danger of frost has passed. However, they can also be planted in the fall.

How Much Sunlight Do Crocosmia Plants Need?

Crocosmia plants thrive in full to partial sunlight. At least 6 hours of sunlight per day is recommended for optimal growth.

What Type Of Soil Is Ideal For Crocosmia?

Crocosmia plants grow best in well-draining soil that is rich in organic matter. A pH level of 6.5 to 7.5 is ideal for these plants.

How Do I Prepare The Planting Area For Crocosmia?

Before planting, loosen the soil and remove any weeds or debris. Mix in compost or well-rotted manure to improve the soil’s texture and nutrient content.

How Deep Should I Plant Crocosmia Bulbs?

Crocosmia bulbs should be planted 3-4 inches deep, with the pointed end facing up. Space them at least 6 inches apart to allow for proper growth and air circulation.