Knowing when to prune your perennials can make a big difference in your garden’s health and appearance. Some perennials should be cut back in the fall to reduce pests and diseases like powdery mildew ...

Forsythia shrubs grow rapidly and can quickly take over garden beds if not pruned every year or so. Also, like lilacs, forsythias bloom on old wood. So, pruning them in the fall could remove the ...