Lavender can survive winter in Wisconsin, particularly in the southern and central parts of the state which fall within hardiness zone 5a. It is important to choose a cold hardy variety of lavender, and the English lavender (Lavandula angustifolia) is the most suitable for Wisconsin’s climate.
Two reliable performers for the home landscape in Wisconsin are the Munstead and Hidcote varieties of English lavender. These cultivars have been proven to withstand colder temperatures and are well adapted to the region. They can tolerate the harsh winter conditions and still come back strong in the spring.
To give lavender the best chance of surviving winter, it is important to provide it with the right growing conditions. Lavender prefers well-draining soil, so if your soil tends to be heavy or clay-like, it is advisable to amend it with compost or other organic matter to improve drainage. This can be done by gently working the compost into the soil surface before planting.
When it comes to fertilization, lavender is a relatively easy-going plant that does not require much feeding. Instead of relying on fertilizers, it is best to focus on providing the plant with good soil and proper care. Lavender actually thrives in lean soil, so excessive fertilization can lead to leggy growth and reduced hardiness. A balanced approach is to enrich the soil with compost, which not only improves drainage but also provides some nutrients to support lavender’s growth.
In terms of winter care, there are a few steps you can take to help lavender survive the cold season. One important consideration is to ensure the plants are well established before winter arrives. This means planting lavender in the spring or early summer to allow it enough time to develop a strong root system.
Another helpful practice is to avoid excessive moisture during winter, as wet soil can lead to root rot and ultimately kill the plant. To prevent this, it is important to choose a well-draining location for planting and avoid overwatering. Lavender is drought-tolerant once established, so it is generally better to err on the side of underwatering rather than overwatering.
Mulching can also provide some protection to lavender during winter. Applying a layer of organic mulch, such as straw or wood chips, around the base of the plants can help insulate the roots and prevent extreme temperature fluctuations. However, it is important to avoid mulching too early in the fall, as it can trap moisture and promote rot.
During particularly harsh winters, it may be beneficial to provide additional protection for lavender. This can be done by covering the plants with a breathable material, such as burlap or frost cloth, during periods of extreme cold or heavy snowfall. This helps to shield the plants from harsh winds and prevents excessive snow accumulation, which can weigh down the branches and cause damage.
In my personal experience, I have successfully grown English lavender in a zone 5a region. By following the guidelines mentioned above, my lavender plants have reliably survived the winter and continued to thrive in subsequent seasons. It is important to note that while lavender is generally hardy, extreme and prolonged winter conditions can still pose a challenge, so it is always advisable to monitor the plants and provide additional protection if needed.
With the right variety selection, proper soil preparation, and appropriate winter care, lavender can indeed survive winter in Wisconsin. The hardy English lavender cultivars like Munstead and Hidcote are well-suited to the region and can withstand the cold temperatures. By providing good drainage, avoiding excessive moisture, and considering additional protection during harsh winters, lavender can thrive and add beauty to the Wisconsin landscape.
