Growing lavender in Maine can be a challenge, but equipped with the right information and doing some simple planning, one can successfully enjoy this versatile landscaping plant. The growing zones for most of Maine are right on the fringe for lavender.
The ideal growing conditions for lavender are that of a Mediterranean climate. Lavender doesn’t require rich soil – in fact , it does best where the soil is a bit lean and the pH is neutral or even ‘sweet’.
There’s one thing that lavender hates more than the cold – that is having wet, not very well drained soil. If you have a heavier soil, like ours in Central Maine you could improve the conditions by adding some grit to the soil – in the form of sand and/or gravel.
If you have fairly level ground and heavy soil, you can create hills or mounds in order to keep the roots out of wet earth.
Different varieties of lavender vary in their tolerance of cold. The Lavandula angustifolia (English Lavender) is one of the most widely grown lavenders. It includes varieties such as Hidecote and Munstead which are more tolerant of winter cold and temperature fluctuations (generally zones 5-8). It can also be grown for culinary purposes as it’s not as ‘piney’ as the french or spanish lavenders.
Lavandins (Lavandula x intermedia) need warmer temperatures and drier ground (zones 6-8). They can be grown to zone 5, so if you’re planning on growing these, you should plan on a lot of winter protection. They put out lots of showy spikes and are very fragrant, although they lack the ‘sweetness’ of the English varieties. Grosso is a very common French lavender variety.It grows up to 36″ wide.
Spanish lavender (Lavandula stoechas) is probably not suitable for the Maine climate unless grown in containers and brought inside. Most need a hot, dry environment (zone 8-9) They do, however, have some of the most interesting colors and flower shapes of the lavenders.
If you plan on growing lavender in Maine, for best results you should cover them once consistent cold occurs. Don’t be in a rush or the mice will make their home along with the protected lavender and ruin a lot of it. Wait until the mice have made their winter burrows elsewhere. Cover with a thick layer of straw, or heavy floating row cover that’s pinned or weighted down. It should be checked periodically to make sure the wind hasn’t uncovered any of it.
Once the weather has warmed, and there’s no threat of a hard freeze the covering can come off. Don’t be distraught if it looks as though the lavender is dead. It takes a bit of warm weather and sunshine for the lavender to start its new growth. By May you should see the your lavender coming to life.