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Close up image of the reddish flowers of the Broad Leaved Dock
Lawn Weeds

Common Weeds with Red Flowers: Lawn Care Tips

This is your TopGrass guide to weeds with red flowers!

By Peter Arnold•21 October 2025•Updated 12 February 2026•3 min read

Red-flowered weeds might stand out in your lawn, but that doesn't mean they belong there.

Weeds like broad-leaved dock and scarlet pimpernel may look colourful, but they’re tough, persistent, and can quickly take over if left unchecked.

If you’ve noticed red blooms popping up in your grass and aren’t sure what they are, or how to get rid of them, this guide has you covered. We’ll walk you through some of the most common red-flowering weeds and give you practical advice on how to stop them from spreading and keep your lawn looking its best.

Close up image of the reddish flowers of the Broad Leaved Dock
Close up image of the reddish flowers of the Broad Leaved Dock

Broad-Leaved Dock (Rumex Obtusifolius)

Description:

Broad-leaved docks are one of the most common species of the dock-leaved family of weeds. It can be discerned by its deep-green, oval-shaped leaves and its reddish flowers that bloom on stems that grow upright.

Season:

This weed's flowering period is in the summer to early autumn, June to September

Growth Habits:

Broad-leaved docks can disperse the seedlings via the wind, meaning they can quickly spread around a lawn. 

Broad-leaved docks have a lateral rooting system called a taproot, in which they can regrow if parts of the roots are broken off. 

Common lawn issues:

Broad-leaved weeds can grow in a wide variety of soil types and conditions so they can quickly become a problem in your lawn. They can outcompete the grass plant for vital nutrients, so controlling them could be essential to helping your lawn flourish.

Control:

Deadheading broad-leaved weeds will help to prevent seed dispersal and the spread of the weed.

Selective weed control, which is a part of both our Early Season Treatment and Mid-Season Treatment, can help to tackle broad-leaved docks.

Close up image of the red flowers of the scarlet pimpernel
Close up image of the red flowers of the scarlet pimpernel

Scarlet Pimpernel (Anagallis Arvensis)

Description:

The scarlet pimpernel can be recognised by its flower heads that consist of 5 equally sized petals, which are darker in colour the closer to the seedlings. 

Season:

Scarlet pimpernel blooms during early summer to early autumn, from June to September.

Growth Habits:

The flowers of the scarlet pimpernel only open up when the sun is shining. 

Common lawn issues:

It is a low-growing weed, so it can avoid being mowed even when on a low setting.

Control:

A well-fertilised lawn will help the thickness of the lawn and the strength of the grass plant. This will help to prevent scarlet pimpernel from appearing, as it does well in lawns that are lacking in growth. Our Annual Lawn Care Programme contains fertiliser treatments that can help you to achieve a strong, lush lawn.

Selective weed control, which is a part of both our Early Season Treatment and Mid-Season Treatment, can help to tackle scarlet pimpernel.

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