In USDA Zone 6, where stem dieback is common, there are certain lavender varieties that can be considered perennials. Among these are Lavandula angustifolia, Lavandula × intermedia, and Lavandula × chaytoriae. These lavenders are typically listed as hardy in Zones 6-9, indicating their ability to withstand colder temperatures.
Lavandula angustifolia, commonly known as English lavender, is one of the most popular lavender species. It is known for its aromatic fragrance and beautiful purple flowers. In Zone 6, English lavender can be grown as a perennial, provided it is given proper care and protection during the winter months. Mulching around the base of the plant can help insulate the roots and prevent frost damage.
Lavandula × intermedia, also known as lavandin, is a hybrid lavender that is a cross between Lavandula angustifolia and Lavandula latifolia. It combines the hardiness of Lavandula latifolia with the fragrance of Lavandula angustifolia. This hybrid lavender is often grown as a perennial in Zone 6, as long as it is given adequate winter protection.
Lavandula × chaytoriae is another hybrid lavender, created by crossing Lavandula dentata and Lavandula angustifolia. It is known for its compact size and unique flower spikes. Like other lavender varieties, Lavandula × chaytoriae can be grown as a perennial in Zone 6, provided it is given proper care and protection from harsh winter conditions.
To ensure the longevity of lavender plants in Zone 6, it is important to consider a few key factors. First, selecting varieties that are listed as hardy in Zones 6-9 is crucial. These varieties have a higher chance of surviving the winter and returning year after year. Additionally, providing adequate winter protection is essential. This can be done by mulching around the base of the plants, covering them with a layer of straw or pine needles, or even using protective covers or cloches.
It is worth mentioning that even with proper care and protection, there is still a risk of some lavender plants not surviving the winter in Zone 6. Factors such as extreme cold temperatures, prolonged wetness, or poor drainage can increase the likelihood of plant loss. However, by choosing the right varieties and implementing proper winter protection measures, the chances of successfully growing perennial lavender in Zone 6 can be significantly improved.
In my personal experience, I have successfully grown Lavandula angustifolia and Lavandula × intermedia as perennials in Zone 6. By providing them with mulch during the winter and ensuring they are planted in well-drained soil, I have been able to enjoy their beauty and fragrance year after year. However, it is important to note that individual results may vary, and it is always a good idea to research specific varieties and consult with local gardening experts for the best practices in your specific Zone 6 location.