Supertunias run circles around regular petunias—they stay compact, branch on their own, and keep flowering without the constant pinching other varieties demand. You'll get weeks of colour from a single plant, whether you tuck it into a bed, a hanging basket, or a pot on the porch.

Set out after danger of frost passes in spring and watch them perform through the heat. One gallon size means you're starting with a plant ready to go, not a slip.