And color is a personal thing. When you get to the exciting, hot colors, you have to be a little more discriminating and even use foliage to separate warring shades of orange, magenta, red and the like. If you put two colors together and it looks like they're going to fight with each other, separate them with green foliage, or off-white or silver. Pick your color scheme and repeat it, she says, and not necessarily with the same kind of plant. What you want to visualize is a wavy circle.
Straight lines are for vegetable gardening.