Favorite Annuals – Flowers These tried and true favorites are always on a Master Gardener’s shopping list. Many are Texas Superstars. Spring to Summer – Delphinium, Penta, Portulaca, Purslane, Cosmos, ‘Wave’ Petunias and Plumbago. Summer – Esperanza, Zinnias, and Marigolds. Winter – Snapdragons, Pansies and Violas Pansies – Light shade to full sun.