'Rosemary is quite unpretentious when it comes to pruning, so you can do it anytime starting from spring and up until four to six weeks before the first frost hits,' says Bryan McKenzie
'Rosemary is a perennial herb that can be grown indoors or out. It's best to prune rosemary when the plant is in active growth and in full sun. Pruning will encourage new growth, making your plant fuller, bushier, and more attractive,'.
Regular trimming of rosemary is necessary, especially if you want to harvest the leaves or blossoms. Depending on whether the rosemary is a bush or a tree, Melody advises trimming right before it blooms.