Perennial in zones 4-8 or grow as an annual. Ring in early spring with a vibrant mix of colors! This short but sweet wildflower of the northern hemisphere is commonly found in the understory at the base of trees. We love to grow primrose en masse as a groundcover, in rock gardens, shade gardens and containers. Plants are super cold hardy and will be among the first to bloom in spring. The short and stout rosette-shaped plants reach just 4 inches tall and 8 inches across. If allowed to perennialize, they will spread by clumping roots, which can be divided in summer/fall. Full Sun Sprouts in 20-45 Days Seed Depth: Surface Sow Ideal Temperature: 65-70 F Plant Spacing: 12-18" Frost Hardy: Yes primula spp.