A curated selection of live potted perennial plants sold in #3 nursery containers — the standard horticultural designation for a 3-gallon pot — featuring well-established root systems ready for in-ground planting or large containers. Unlike annuals, perennials return year after year from their root systems, making them a long-term investment in the garden. The specific plant varieties are assorted and may change by season and warehouse location.

Common varieties in Costco's assorted perennial offerings include popular landscape staples such as hostas, heucheras (coral bells), coneflowers (echinacea), black-eyed Susans, daylilies, astilbes, ornamental grasses, and salvia. The #3 container size indicates a mature, established plant that will establish quickly in the garden and often blooms in the first season after planting. These plants are typically suited for USDA hardiness zones 3–9, though specific cold-hardiness depends on the variety received.

Plants thrive in garden beds, borders, and large patio containers. Most perennials prefer well-drained soil amended with compost and benefit from regular watering until established. After the first season, many require minimal supplemental irrigation. Deadheading spent blooms can encourage continued flowering, and light mulching in fall helps insulate roots over winter in colder climates.