Don is especially high on the 'Knockout' shrub rose, which swept the garden world for ease of culture, unique beauty, fragrance, disease immunity, and abundant blossoming into fall. Bonus: It's especially resistant to blackspot, a fungus that thrives in the Ozarks' high humidity. "I call it the non-gardener's rose because it's indestructible," says Don. Note: The American Rose Society named 'Knockout' its Member's Choice Rose for 2004.