Annual Meadow Grass
Grassy weed
Annual meadow grass, Poa annua, is probably the most familiar grassy weed in British gardens. It colonises lawns, paths, pots and bare soil with remarkable speed. Although usually an annual, it can behave as a short-lived perennial in mild, moist places, producing seed through much of the year and at almost any mowing height.
How to identify it
Look for small, soft, bright-green to slightly grey-green tufts, usually 5 to 25 cm tall. The leaf tips are often shaped rather like a tiny boat, and the stems carry open, branching flower heads with pale green spikelets. It flowers and seeds even when closely cut, so lawn plants may show only a few centimetres of flowering stem. Roots are fine and fibrous rather than deep or creeping, making individual plants easy to lift from loose soil.
Where it grows
It appears wherever soil is disturbed or kept moist, including vegetable beds, borders, containers, cracks in paving and compacted lawns. In UK gardens it can germinate in every season when conditions are mild, though flushes are especially noticeable from spring to autumn. Shady, damp ground and over-watered pots are particularly welcoming.
Why it is a problem
A few plants are easily dealt with, but each can shed plentiful seed before it is noticed. In lawns it can make the surface look patchy, pale and uneven, particularly in dry weather when its shallow roots suffer. In beds and pots, dense seedlings compete with young crops and ornamentals for moisture, light and nutrients.
How to control it
Hoe seedlings on a dry day, leaving them on the surface only when they will dry out fully. Hand-weed larger tufts before flower heads open, taking the fibrous roots with them. Check beds frequently because new seedlings emerge quickly from seed already in the soil. Keep bare ground covered with an organic mulch or a light-excluding cover where practical, and avoid letting plants seed in paths, pots or lawn edges. Regular mowing helps appearance but does not prevent flowering, so remove seed heads where possible.
Commonly confused with
It can resemble other fine lawn grasses, especially smooth meadow grass and fescues. Annual meadow grass is usually softer, lighter green and more willing to flower when very short. Its low, tufted habit and near-continuous seed heads are useful clues, rather than a single feature alone.
Annual Meadow Grass: frequently asked questions
How do I identify annual meadow grass?
Look for small, soft, bright-green to slightly grey-green tufts, usually 5 to 25 cm tall.
How do I get rid of annual meadow grass?
Hoe seedlings on a dry day, leaving them on the surface only when they will dry out fully.
Where does annual meadow grass grow?
It appears wherever soil is disturbed or kept moist, including vegetable beds, borders, containers, cracks in paving and compacted lawns.
General guidance for UK gardens and allotments, focused on prevention and non-chemical control. For a confirmed identification, the RHS or a local garden centre can help. Page updated 19 Sep 2026.