Answer: I would prune them back now in hopes of them producing new flowering growth. Lavenders sometimes take up to 3 years to flower but if yours are 4 years old, they are certainly mature enough to flower. Try keeping the plants on the dry side (too much water will encourage green growth but no flowers) and too much nitrogen can have the same effect. So, cut down a little on your watering and don't feed your plants. Shear them back now. I hope this combination will result in lots of flowers this summer. Enjoy your plants!
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