For the Deck- Mosquito grass (a.k.a. Lemon Grass) repels mosquitoes | the strong citrus odor drives mosquitoes away--very functional patio plant, plus, the leaves make a great healthy tea, and the cut up stems are great in Thai dishes, like Tom Lum (coconut milk) soup.
Plants have best friends just like people do. Marigolds help tomatoes and roses grow better. Nasturtiums keep bugs away from squash and broccoli. Petunias protect beans from beetles and oregano chases them away from cucumbers. Geraniums keep Japanese beetles away from roses and corn. Chives make carrots sweeter, and basil makes tomatoes even tastier