How to Grow Prairie Dropseed
Sporobolus heterolepis
Prairie Dropseed is a fine-textured mounding grass that earns its place through elegance and fragrance. The arching green foliage forms a neat 60 cm dome that turns golden amber in autumn, while the airy seed heads release a distinctive coriander or popcorn scent. Plant in spring in full sun and well-drained soil, even poor or sandy. Space plants 50 cm apart. Water regularly in the first two seasons to establish; after that it is highly drought-tolerant. Be patient, it is very slow to establish and may take three years to flower. Never cut back in autumn. Cut to 10 cm in late February before new growth begins. Divide congested clumps every four to five years in spring.
Yearly Lifecycle
Care Essentials
Rarely needed. Prairie Dropseed thrives in poor soils and feeding encourages floppy growth. A light topdress of compost in spring is sufficient.
Watch For
- Rust in humid conditions
- Clay soil rot
Companions
Echinacea, Rudbeckia, Liatris, Amsonia
Care Requirements
Light
Full sun essential
Prairie Dropseed requires at least six hours of direct sun daily. In shade it becomes open and floppy, losing its characteristic mounding form.
Watering
Drought-tolerant once established
Water regularly in the first two seasons. Once established it is highly drought-tolerant and thrives without supplemental irrigation even in dry summers.
Fertilizing
Avoid feeding
Rich soils and feeding cause floppy, open growth. Plant in poor to average well-drained soil and do not fertilise.
Pruning
Cut back to 10 cm in late February
Leave all old growth standing through winter. Cut to 10 cm above ground in late February or early March before new shoots emerge.
Mulching
Light gravel mulch
Apply a thin layer of gravel or grit around the crown. Avoid organic mulches that retain moisture against the crown.
Growing Tips
Patience is rewarded
Prairie Dropseed is notoriously slow to establish. Expect little growth the first year and no flowering until the third. Once mature, it is one of the most elegant and long-lived prairie grasses.
The fragrance is unforgettable
The airy seed heads release a distinctive scent variously described as coriander, cilantro, or buttered popcorn. Plant near paths or seating areas to enjoy it in late summer.
Leave it standing all winter
The golden amber stems hold their colour beautifully through winter and protect the crown from frost. Cut back only in late February.
Divide every four to five years
Clumps slowly expand but rarely need dividing. If the centre dies out, lift and divide in early spring, replanting vigorous outer sections.
