Matrix planting: meadow-style perennial design

Matrix planting is a planting design approach derived from ecological research on natural plant communities, in which ground-covering "matrix" plants (typically grasses or low perennials) form a structural carpet through which "emergent" or "feature" plants (taller forbs, statement perennials).

Matrix planting is a planting design approach derived from ecological research on natural plant communities, in which ground-covering "matrix" plants (typically grasses or low perennials) form a structural carpet through which "emergent" or "feature" plants (taller forbs, statement perennials) arise. Per Thomas Rainer and Claudia West's work described by Penn State Extension, the matrix approach mimics the structure of natural meadows and prairies rather than the traditional "island of specimens in mulch" approach that characterizes most residential landscapes.

The term was brought to wider attention through Nigel Dunnett (University of Sheffield), Piet Oudolf, and the book Planting in a Post-Wild World by Rainer and West (2015).

The matrix structure

Per Rainer and West (Planting in a Post-Wild World, 2015), and covered in University of Delaware Extension course materials, a matrix planting has three functional layers:

1. Structural layer: Long-lasting, woody or semi-woody plants (shrubs, grasses, tall perennials) that provide winter silhouette and seasonal structure
2. Matrix layer: Low, spreading plants that cover the ground, crowd out weeds through canopy closure, and form the visual "carpet" — typically 12—24 inches tall
3. Seasonal layer: Geophytes (bulbs, corms), annuals, or short-lived perennials that move through the matrix and add seasonal interest

The matrix layer is the defining component. It must:

• Cover the ground at least 70% within 2 seasons of planting
• Tolerate the site conditions reliably
• Be visually attractive or at least neutral