Garden Scheme
Plant library · Ornamental Grasses
Andropogon gerardii
Big Bluestem is a tall, native perennial grass that brings a strong vertical element to sunny planting plans. Its blue-green summer growth shifts toward copper-red in fall, extending its visual role beyond the main flowering season. At about 6 feet tall, it reads best as a background grass, a broad accent in open beds, or a repeated element in meadow-style layouts.
Space Big Bluestem 3 ft apart, measured center to center (90 cm).
The mature spread is about 2.5 ft (75 cm), leaving roughly 6 inches (15 cm) of open ground between plants once they are full grown.
Treat 3 ft as a planning baseline — cultivar and local growing conditions shift the final footprint.
Place Big Bluestem behind lower perennials, along the back of a deep border, or in grouped runs where its height can form a loose seasonal screen. Use it where a 6-foot plant will not block a window, sightline, or narrow path as summer growth fills out. It also suits meadow and naturalized areas, where several clumps can create a more continuous upright layer without making a formal hedge.
Set plants 3 feet apart, center to center. Each clump reaches about 2½ feet wide, so that interval leaves a modest gap between mature plants rather than merging them into a solid wall. In a border, keep the front edge of the planting far enough back from paths that the tall foliage and late-season stems do not crowd circulation or conceal shorter plants.
Reserve a full-sun position for the most upright, dependable form; shade can make stems less self-supporting. Once established, Big Bluestem handles dry conditions well, making it a practical choice for lower-water areas with well-drained ground. Avoid placing it where persistent winter wet is likely, especially in compact planting pockets with poor drainage.[1][2]
The main display builds through summer, with flowering and seed-head interest arriving from late summer into fall. Copper-red foliage gives the clump a stronger autumn presence, and the standing stems can continue to give the bed structure into winter. Cut old growth to the ground in late winter or early spring, before new shoots begin, so fresh growth has a clear start.[1][2]
Allow patience for establishment: this grass can be slow to settle in before developing its full presence. It spreads by short rhizomes and may also seed in favorable conditions, so leave room for periodic editing at the clump edge. In a compact mixed border, use nearby plants and regular removal of outward shoots to maintain the intended footprint.[1][3]