Pruning is the process of removing dead, diseased, or unwanted plant material. Pruning petunias encourages bushier growth, more blooms, and a tidier appearance. Petunias are easy to prune, and it can be done at any time during the growing season.
To prune a petunia, simply pinch off the tips of the stems. You can also remove any dead or diseased leaves. If the plant is getting too leggy, you can cut it back by about one-third.