Verbena fills gaps fast once heat arrives, offering weeks of small clustered flowers on plants that spread low and wide. It asks for sun and decent drainage, then mostly takes care of itself through August.

These 4" pots go into the ground or a patio container while they're still small, so they'll have room to sprawl. Pair them with taller plants or let them cascade over an edge—either way, they earn their spot without demanding anything.