March’s herb of the month is lavender.
This growing information is for Grosso lavender (the variety that I planted in my front garden last year), but other lavender should have similar growing requirements. Grosso lavender is hybrid of cold-hardy English lavender (Lavandula angustifolia) and heat-tolerant Portuguese Lavender (L. latifolia). It is the primary commercial variety for the production of lavender oil.
Grosso Lavender Care
Size: The Grosso variety of lavender can get up to 2.5 feet (76 cm) tall and wide.
Water Requirements: This lavender prefers soil that is kept between dry and moist.
Soil Requirements: Grosso lavender grows best in neutral to slightly alkaline soil that is well drained.
Light Requirements: Grosso lavender does best in full sun.
Temperature Requirements: This lavender grows well in USDA zones 5 to 8, though may not survive the winter if the temperature gets below 0F and there is no snow to insulate the plant.
Nutrient Requirements: Lavender actually prefers a soil with somewhat low fertility.
Pruning: For continued blooming, remove faded flowers. About every three years, prune back to 8 inches (20 cm) tall in the spring.
Pests: This lavender is susceptible to root rot and leaf spot.
Blooms: The blooms of this lavender are lavender in color and very fragrant. Blooms appear from June to August.