Answer: French lavender can be trimmed to keep it in shape. Prune it lightly in the spring, then again in mid-summer and once again in late fall. Remove only a few inches of growth from each stem. Pruning back will encourage additional branching and lots more flowers.
You can transplant your dwarf lilacs when the weather cools in the fall, or in the winter, anytime the ground is not frozen. I'd transplant in the fall so the roots can establish themselves and be ready to grow in the spring.
Best wishes with your landscape!
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