To insure continuous flowering, feed your roses with a fertilizer blended especially for Knockout roses after each bloom cycle (ie. 3% N, 4% P and 3% K with 9% Ca, 0.5% Mg and 1% S).

How to deadhead roses in summer Deadheading is very easy as you just need a sharp pair of shears or scissors. Look for any faded flowers, and any cut the dying blooms and not any healthy ones.