As an avid gardener and landscaping enthusiast, I can confidently say that leaving lavender out all winter depends on the specific type of lavender and the climate in which you live. English lavender, which is winter-hardy to Zone 5, can generally withstand colder temperatures and may only require a bit of protection. On the other hand, Spanish and French lavenders are not as cold-tolerant and will need some extra care if you live in a colder region.
English lavender, also known as Lavandula angustifolia, is the hardiest of the lavender varieties and can survive winter temperatures as low as -15°F (-26°C). In Zone 5 and above, English lavender can usually be left outdoors without much worry. However, it is always a good idea to provide a thin layer of straw or mulch around the base of the plant to help insulate the roots and protect them from extreme temperature fluctuations. This layer of insulation also helps to retain moisture in the soil, which is beneficial for lavender plants.
When applying straw or mulch, be sure to avoid piling it up too high around the stems, as this can create a moist environment that may promote rot or fungal diseases. Instead, spread a thin layer of straw or mulch around the base, leaving a small space around the stems to allow for air circulation.
On the other hand, Spanish lavender (Lavandula stoechas) and French lavender (Lavandula dentata) are not as cold-hardy as English lavender. They are typically only hardy to Zone 8 and may not survive the harsh winter temperatures in colder areas. If you live in Zones 7 or below, it is advisable to bring these lavender varieties indoors during the winter months.
To bring Spanish or French lavender indoors, you can either dig up the plants and pot them, or you can take cuttings and root them in containers. Place the potted lavender plants in a sunny location indoors, such as a south-facing window, where they can receive at least 6-8 hours of sunlight per day. Be sure to water them sparingly, as overwatering can lead to root rot.
If you choose to overwinter lavender plants indoors, it is important to monitor them closely for any signs of stress, such as wilting or yellowing leaves. Adjust the watering and lighting conditions accordingly to ensure their well-being.
While English lavender can generally be left outdoors all winter in Zone 5 and above, Spanish and French lavenders will require some extra care and should be brought indoors in colder areas. By providing a thin layer of straw or mulch for insulation or by bringing them indoors, you can help ensure the survival of your lavender plants and enjoy their beauty year after year.
