Sesleria autumnalis is a cool-season, semi-evergreen grass native to limestone woodland edges and open scrubland in southeastern Europe. It forms a low, tidy mound of bright chartreuse-green foliage and produces slender, whitish flower spikes from late summer into fall — an unusual phenology for a cool-season grass. Its capacity to perform in dry shade puts it in a category by itself among ornamental grasses.
It adapts readily to clay soils, alkaline pH, and lean ground beneath deciduous trees. Unlike many ornamental grasses, it rarely needs division and does not require an annual hard cutback. In colder zones it dies back partially in winter; in milder climates it holds foliage year-round. Established plants are drought tolerant and deer resistant. Mulching the crown in zone 5 during the first winter improves establishment.
Autumn moor grass functions well as ground cover or border edging under canopy shade where turf grasses and most ornamental grasses fail. Its pale, luminous foliage lightens dark corners through the full growing season and provides structure into winter.
Crown Rot
Lower leaves yellow and wilt; the base of the rosette turns brown and soft, sometimes with white fungal threads at the soil line. Plants collapse in wet conditions.
Remove and destroy affected plants. Improve drainage and avoid overhead watering. Do not mulch directly against the crown. Space plants for airflow and avoid replanting in the same wet spot.
Fungal leaf spot
Brown or purplish spots on the leaves, often ringed with a yellow halo, that spread and merge in warm, humid, or wet weather; heavily spotted leaves yellow and drop early.
Pick off spotted leaves and clear fallen debris to remove overwintering spores. Improve air circulation by thinning, and water at the base so foliage dries quickly. If it persists, apply a copper- or sulfur-based fungicide at the first sign.