When your lavender plant won't bloom the problem usually comes down to not enough sunlight in that spot. Rich soil, bad pruning, and too much fertilizer also stop flowers from forming. Fix these issues and your plant should start blooming again within a season or two.
I had a beautiful big lavender that refused to flower for two whole years in my garden. The plant looked healthy with lots of green leaves but zero blooms. Once I dug it up and moved it to a sunnier spot, it bloomed like crazy the next summer. The old spot only got four hours of sun instead of the eight it needed.
Penn State guidance says lavender needs 6-8 hours of direct sunlight every day at minimum to flower well. Even partial shade drops your bloom count way down. Track how much sun your plant gets by checking it every few hours on a clear day. You may find your spot gets less light than you thought.
Too much nitrogen in your soil pushes leaf growth instead of flowers on lavender plants. Stop feeding your lavender with regular plant fertilizer that's high in nitrogen. These plants come from poor rocky soil in nature. They don't need the rich conditions that other garden plants love so much.
Lavender bloom problems often trace back to pruning mistakes too. Cutting into old woody stems removes the parts that produce flowers. Only prune the green growth and leave a few inches of this year's stems on the plant. Late summer after flowering ends works best for most pruning jobs.
Checking for lavender not flowering starts with an honest look at your growing conditions. Write down hours of direct sun, soil type, and what fertilizers you've used in the past year. Compare these notes against what lavender needs and you'll likely spot the problem fast.
Moving your plant to a better location gives you the best results if sun is the issue. Dig up the whole root ball carefully and replant in full sun right away. Water well for the first few weeks while roots settle in. Most transplants bounce back fine if you do this in early fall.
Give your changes time to work before you give up on the plant. Lavender may take a full growing season to respond to better conditions. Keep the soil on the dry side and avoid adding any fertilizer while you wait. Patience pays off when dealing with stubborn plants that won't bloom.
Read the full article: How to Grow Lavender From Seed Successfully
