A. Take a look first where it is planted. Rosemary likes a free-draining soil. If planted in waterlogged soils, plants may succumb to root rot. Check to see if water pools around your plant after watering or after a rainy spell. If it does, it might be best to shift it to a more free-draining spot. Incorporate grit or pumice into your soil to ensure better drainage. Rosemary also likes a slightly limy soil. If your soil is particularly acidic, add lime to make it more alkaline. An occasional liquid feed can benefit plants, but it’s not essential. However, I would recommend giving your rosemary a light prune, even just a tip prune, each year to maintain its shape and prevent legginess. Wait until after flowering to prune, and avoid cutting back into leafless wood as it won’t resprout. Jane
This gorgeous photo comes from here.