Continuing on with color scheme discussion, since we seem to have lost the edit function.
As well as the related/ complementary colors Mg suggested, you could also do contrasts, if done carefully. You wouldn't want a stripey effect like red - white - red - white. What you want in that case is a major color and a minor color. So you could do, for example, a hedge of mainly red roses, with 1/4 - 1/3 of them scattered through being white roses (or of course vice versa). The contrasting accent color, will wake it up and make everything pop, so you don't get the boringness of 200 feet of red. You can do that with one major color and one minor color or you can do it with one major color and two (related) minor colors, say a hedge of white roses with a few red and a few pink, mixed in as accents. No more than that or you are back to the jumble effect.
Mg's version is easier and more forgiving and a softer effect. If you like energy and excitement, the high contrast would be more of that. I'm the high contrast kind of gal -- my front yard is all done in purples and yellows -- but that is strictly personal preference.