Slender Speedwell [Veronica filifomis]
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
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
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
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.