It should be mentioned that Double KnockOut roses are later versions of Radler’s originals and, as their name implies, they have a double layer of petals. And Sunny Knockout, by the way, is ...

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).

The idea of flowers fading from yellow to white might evoke complaint in some quarters. Why not plant pure yellows next to pure whites and be done with it? You will achieve the same effec… ...

The combined presence of five characteristics has made KnockOut roses such a success: disease resistance (no black spot or powdery mildew), drought tolerance, cold tolerance, self cleaning (no dead… ...