How Far Apart to Plant Perennials for a Healthy, Long-Lasting Garden

Proper spacing is a modest upfront investment that pays off in years of color and interest. Consult a reliable perennial reference—such as The Complete Perennials Book by Ortho or the Miracle-Gro Guide to Growing Beautiful Flowers—for specific spacing, soil, sunlight, and water needs.

For nursery-grown plants, check the label; preferred spacing is usually a range (e.g., 18–24 inches). Planting closer yields a fuller garden faster but requires earlier division and increases fungal disease risk due to poor air circulation. Most perennials benefit from division every 3–5 years.

If specific information is unavailable, use this general rule: space small perennials 6–12 inches apart, 2–3-foot-tall perennials 12–18 inches apart, and taller perennials 18–36 inches apart.