Sesleria caerulea aka Blue Moor Grass

Sesleria caerulea, or blue moor grass, is a perennial grass. It belongs to the grass family, Poaceae. Its native range covers Europe, including Britain and Ireland. It grows in meadows and woods with rich, alkaline soil. This cool-season grass forms low, loose tufts of evergreen leaves. The clumps give gardens leaf colour throughout the year.

Garden plants stand about 0.5–1 foot [0.15–0.3 metres] tall. Spread varies more between sources, from 1–3 feet [0.3–0.9 metres]. RHS gives a broader height range, reaching 1.6 feet [0.5 metres]. Leaves grow from the base and twist as they extend. Their narrow blades have smooth edges and no hairs. They can exceed 0.5 feet [0.15 metres] in length. Sources differ on which leaf surface carries the blue tint. Both describe a mix of blue and green tones. Some leaf surfaces also have a glossy sheen.

Small flower heads rise above the leaves in spring. Sources describe greenish spikes or short, egg-shaped purple heads. The reported bloom season runs from March through June. The heads fade to silver or a pale buff shade. Flowers play a smaller garden role than the coloured leaves. The fruit is a caryopsis, the grain-type fruit of grasses.

Grow this grass in full sun or partial shade. It needs soil that drains well, with moderate fertility. Neutral to alkaline soil suits it, including loam and chalk. Average moisture supports growth, though the plant also tolerates drought. Sources list USDA zones 4–8 or 5–8. RHS rates it H7 for cold winter conditions. Plants take about two to five years to reach maturity. Remove dead leaves when needed to keep the clump neat. Sow seed in cold-frame containers in spring or autumn.

Use the low clumps beside paths or along border edges. They also suit rock gardens, pots, and spaces among spring bulbs. Groups can form ground cover or replace lawns in quiet areas. The grass does not cope well with regular foot traffic. It tolerates air pollution and planting near black walnut trees. Sources also list resistance to deer. Care demands are low, with no major pest or disease concerns reported. These sources do not establish edible uses or safety for people or pets.