The only thing better than buying plants is buying plants on sale. Direct Gardening's sale category features a wide selection of discounted plants including perennials, shrubs, trees and flower bulbs. You'll find plants for shades, plants for sun and deer-resistant plants, too. When shopping for plants on sale, first consider your hardiness zone and make sure the plants will grow there. Next consider the amount of sunlight the area receives. Full sun is considered areas that receive at least six hours or more of direct sunlight daily. Other factors to consider when buying on sale plants are mature height and spread, maintenance needs, soil requirements, water needs, flower color and bloom time.