Here’s his prescription:
1) Lavender is described as a woody or bushy perennial, which means it lives throughout the four seasons and exhibits a dormancy stage in the winter and a reproductive (flowering) stage in the summer.
2) Lavender requires no fertilizers, pesticides, or chemicals to maintain its vigor and no insects or animals prefer the plant as a food source.
3) Be both inquisitive and cautious when selecting over-the-counter and mass-propagated varieties produced in warmer climates. Your selection of lavender should be mainly based on what you observe thriving in your growing region and on what you learn from the all-important label on the plant container.
4) Most plants peak at about two to three feet in height and at least that measurement in width when in full bloom. It may take two or three growing seasons to reach a mature height.
5) Suitable planting conditions exist when the soil drains and does not puddle and remain sticky. The weather should be leaning toward a trend favoring cool and moderate temperatures. Ideally, soil temperature should be above 50 degrees Fahrenheit.
7) Promote sun and good air circulation to produce robust blooms and to maintain the health of the plant. Provide lavender with five or more hours of sunlight each day during the growing season and don’t over water. In general, lavender does not require regular watering and can survive on rainfall alone.
8) Place lavender outside the perimeter of vegetable gardens to attract and invite pollinators.
9) Prune in mid-to-late October and perform the “Halloween haircut”. The weather is still pleasant, the soil is firm, and holiday activities are a month away. When pruned, your plant should resemble a bowl or sleeping porcupine. Always prune so that two to three inches of green growth remain on the plant. Despite what you may have heard or seen, lavender does not respond favorably to heavy pruning deep into the brown woody growth.
10) Harvest lavender for display in a vase or floral arrangement when the buds have swollen to a deep blue or purple color and several of the trumpet flowers have emerged. Harvesting can occur as the flowers continue to blossom. It is also best to harvest when no more than 25-30% of the flowers have blossomed.