when is the best time to trim my knockout roses
You can shape up your Knockout roses at anytime of the year. Heavy pruning during the. blooming season will stop the blooming for four to six weeks, however, it will not harm the. plant in any way. The best time for heavy pruning of Knockout roses is in mid-March. Trim your. Knockouts back to 12â to 18â tall in March and star t feeding them in April. Yes, they will. bloom without food, but they will flourish and explode with color if fed.