Common Field Speedwell
Broadleaf annual weed
Common field speedwell is a small, spreading annual weed whose delicate blue flowers can make it seem harmless. In bare or thinly planted ground, however, it forms low patches that compete with seedlings and set seed freely. Early removal is simpler than teasing its branching stems from amongst close-growing plants.
How to identify it
This low, sprawling plant usually reaches 5 to 20 cm tall, although stems can spread wider across the soil. Leaves are opposite on the lower stems, rounded to oval, softly hairy and toothed around the edge. Small flowers, about 4 to 8 mm across, are blue with a white centre and four petals, usually carried singly from leaf joints. Seed capsules are flattened and notched. Roots are shallow and fibrous, often forming at stem joints where stems rest on damp soil.
Where it grows
It occurs in lawns, borders, vegetable plots, containers and path edges throughout the UK. Seedlings are most noticeable from spring through autumn, though mild winters can support growth. It favours bare, compacted or regularly disturbed soil and can spread through thin turf, around paving and between low-growing plants in sunny or lightly shaded places.
Why it is a problem
Common field speedwell creates a low cover that competes with germinating seed and newly planted crops. Its branching stems make hand-weeding fiddly once it has spread through groundcover or lawn edges. Flowers and seed capsules develop close to the soil, so plants can seed before they seem large enough to be troublesome.
How to control it
Lift young plants by hand before flowers and seed capsules form, following trailing stems so rooted sections are removed. Hoe open soil in dry weather while seedlings are small, then let them dry. In beds, apply an even mulch around established plants to exclude light. Use a light-excluding cover on vacant ground and repair thin lawn patches so the grass shades seedlings. Repeat checks after rain and cultivation, as shallow seedling flushes are easy to miss.
Commonly confused with
It may be confused with germander speedwell or ivy-leaved speedwell. Common field speedwell has relatively small rounded leaves, blue flowers with a white centre and a low, spreading habit. Its notched seed capsule helps distinguish it from small forget-me-nots, which have different flower clusters and foliage.
Common Field Speedwell: frequently asked questions
How do I identify common field speedwell?
This low, sprawling plant usually reaches 5 to 20 cm tall, although stems can spread wider across the soil.
How do I get rid of common field speedwell?
Lift young plants by hand before flowers and seed capsules form, following trailing stems so rooted sections are removed.
Where does common field speedwell grow?
It occurs in lawns, borders, vegetable plots, containers and path edges throughout the UK.
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.