Slender Speedwell [Veronica filifomis]

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Slender speedwell is a perennial weed that can be a major problem in closely mown luxury lawns, as it tolerates close mowing and is resistant to most selective weed killers.

Slender speedwell can colonise a lawn quickly as spreads aggressively by creeping stems. It can also spread when mowing the lawn, as small fragments of stems are able to take root and form new plants.

The leaves are smaller than those of germander speedwell. Slender speedwell leaves are initially kidney shaped, however they take on a more rounded appearance quite often developing toothed edges as they reach maturity.

The flowers can be seen as early as March and last until June. They are blue - purple in colour, each with four petals, however one petal is noticeably smaller than the other three.

Slender Speedwell will grow in a range of soil types, but prefers nutrient rich and wet conditions on closely mown lawns.

A difficult weed to remove by hand once it has established. Encourage a healthy lawn with good turf care practices to discourage this weed.

Regular scarifying or raking prior to mowing will help to weaken and remove Slender Speedwell. Always box off the clippings when mowing the lawn to prevent the weed spreading

Once the weed has been allowed to spread and dominate the lawn, then chemicals will be required to try and control slender speedwell. More than one application will be needed for this weed as it is resistant to many selective weed killers.

Another option is to employ a lawn care specialist who may have access to professional turf care chemicals which will be more effective than those available to buy off the shelf from garden centers etc.

When using any type of chemicals (including weed killers) on the lawn or elsewhere in the garden always wear the correct protective equipment and clothing. Always read the product label carefully and follow the manufacturers health & safety recommendations and application guidelines.

For more information on the application of selective herbicide's please visit our Lawn Weeds page.

Lawn Weed Killer

Verdone Extra
Resolva weed killer
Vitax weed and feed


Resolva 10 litre sprayer
12 litre knapsack sprayer
16 litre knapsack sprayer