· Find it on Amazon. Sun: Full sun for at least 6 hours per day. Water: Water with your lawn in the morning so the afternoon sun may dry leaves. Avoid leaving this plant wet too long. Companion Plants: Dianthus plants and vegetables. Use these stunning flowers to prevent ants, ticks, silverfish, lice, fleas, bedbugs, spider mites, harlequin bugs, rootknot nematodes, and .