How to Grow and Care for Yarrow: Planting Instructions for Best Blooms

A classic perennial, yarrow is a popular addition to many gardens and landscapes due to its vibrant colors and aromatic, fern-like leaves. It’s an incredibly versatile plant, able to thrive in both containers and garden beds, and can reach varying heights and widths depending on its care. This article will guide you through growing and caring for yarrow plants, touching on what not to plant with yarrow, companion plants, and the specifics of yarrow growth in pots.

How to Grow and Care for Yarrow

How to Grow Yarrow in Containers

Growing yarrow in pots offers several advantages, such as control over soil conditions, ease of movement, and greater protection from pests. For a container to foster successful growth, choose a pot with proper drainage and fill it with soil that drains well. The plant should be placed in the pot, leaving the crown of the plant level with the soil surface.

Yarrow is a relatively tall plant, often reaching heights of 24 to 36 inches, and the width usually spans between 18 to 24 inches. These dimensions need to be considered when selecting a pot. Once potted, the yarrow should be watered thoroughly and placed in an area with full sun exposure.

Step-by-step Guide to Planting Yarrow Seeds

Growing yarrow from seed is a rewarding endeavor. Yarrow seeds should ideally be planted in the late fall or early spring. Begin by preparing a seed tray with good-quality seed compost. Spread the yarrow seeds evenly on the compost, lightly layer with compost or vermiculite, and water the tray gently. Keep the tray sunny, maintaining a consistent temperature of about 70°F (21°C). The seeds should germinate within 14-21 days. When the seedlings are big enough, you can move them to pots or plant them directly in the garden. It’s worth noting that yarrow may not bloom in the first year after planting from seed as it takes time to establish.

Best Soil and Sunlight Requirements for Yarrow

Yarrow thrives best in well-drained soil with a pH ranging from 4.0 to 8.0. Thrives in sunlight, but can handle some shade. However, a spot with full sun is optimal for the best blooms and to ensure your yarrow reaches its full height and width. Overly fertile soil can cause the plant to become leggy, so relatively poor, gritty soil is ideal.

Watering Schedule for Yarrow Plants

As a drought-tolerant plant, yarrow does not require frequent watering, making it a great option for xeriscaping. Once established, it typically only needs watering during prolonged dry periods. However, potted yarrows may need watering more frequently due to the increased evaporation from the pot. To water the yarrow, soak the soil thoroughly, then let it dry out completely before watering again.

Pruning and Deadheading Yarrow: a Complete Guide

Pruning and deadheading are vital aspects of yarrow care. Pruning involves cutting back the plant to maintain its shape and size, while deadheading removes spent blooms to encourage further blooming. Yarrow plants generally bloom from late spring to early fall, and deadheading can result in a second round of blooms. When the blooms have finished for the season, cut the plant back to its basal foliage. Regular pruning helps manage the height and width of yarrow plants, while deadheading helps to prolong the bloom time.

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Common Pests and Diseases Affecting Yarrow and Their Treatment

Yarrow is generally resistant to most pests and diseases but is not immune. Aphids, powdery mildew, and rust can occasionally be problems. Aphids can be removed by a strong water spray or by introducing beneficial insects like ladybugs and lacewings that prey on them. To prevent powdery mildew and rust, ensure good plant airflow, avoid overhead watering, and avoid overcrowding. If an infection does occur, remove and dispose of the infected parts of the plant. In severe cases, organic fungicides can be used.

Dividing and Propagating Yarrow Plants

Yarrow is a spreading plant, and division helps keep its growth in check while providing new plants simultaneously. Ideal periods for dividing yarrow are early spring prior to new growth or autumn once flowering has ceased. To divide, dig up the entire plant, get as much of the root system as possible, and then split the plant into smaller sections. Each section should have several healthy shoots and a good root system. The new divisions can then be planted immediately in their new location or potted up.

Winter Care Tips for Yarrow

Although yarrow is a hardy plant and can withstand colder temperatures, providing some winter care can help ensure its survival. In the late fall, cut it down to ground level once the plant has died back. Adding a layer of mulch can provide added protection against freezing temperatures. However, avoid covering the plant’s crown, which can lead to rot. If growing yarrow in pots, consider moving them to a sheltered location or indoors to protect them from extreme cold.

Companion Plants for Yarrow: Enhancing Its Growth and Benefits

Companion planting can be a great way to enhance the growth and benefits of yarrow. It can improve soil quality, deter pests, and create a more attractive and diverse garden. Good yarrow companion plants enjoy similar growing conditions, such as lavender, sage, and rosemary. These plants also have strong scents that can deter pests. Conversely, certain plants should not be paired with yarrow due to competition for resources or susceptibility to the same pests. For instance, yarrow should not be planted with heavy feeders like corn and tomatoes, as they may compete for nutrients.

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Conclusion

Growing and caring for yarrow can be rewarding, offering a beautiful addition to your garden or container collection. From understanding how tall yarrow grows to the nuances of yarrow bloom time, this guide has provided you with the necessary knowledge to embark on this journey confidently. Consider the right companions when planting, and avoid those competing with or harming your yarrow. With proper care and attention, yarrow can provide a long-lasting, vibrant, and aromatic appeal to your garden for many years.

How to Grow and Care for Yarrow: Planting Instructions for Best Blooms