Summer Grassland Weed Control!
Posted on 13 July 2026
Weather conditions throughout the spring have made effective grassland weed management more challenging than usual. With wet/cold weather, followed by prolonged dry spells, has reduced opportunities to treat weeds at their most effective growth stage.
With field conditions improving in grassland areas across the UK, post-silage cutting offers an ideal opportunity to control the regrowth of troublesome broad-leaved weeds such as docks, nettles and thistles while they are actively growing.
Before spraying, consider the following:
- Allow 2-3 weeks after cutting to encourage sufficient weed regrowth.
- Ensure weeds are actively growing and not under drought or other stress.
- Avoid spraying during prolonged hot, dry weather where herbicide uptake may be reduced.
- Observe grazing and cutting intervals stated on the product label following application.
Correct timing is often just as important as product choice when aiming for season-long weed control.
Applying herbicides at the right timing is equally as important as product choice, as it can improve long-term weed control, helping maintain grass quality and maximise productive grazing or future silage yields.
Docks:
Herbicides* containing active ingredients such as fluroxypyr and triclopyr provide excellent treatment options. Docks are best controlled at the rosette stage when actively growing and not under stress, and leaves are a healthy green.
Clayton Docker™ contains 150 g/L fluroxypyr with 150 g/L triclopyr to provide powerful foliar control of broad-leaved and curled docks in established grassland. The dual-active formulation helps reduce weed competition, improve grass utilisation and prolong pasture life.
Thistles:
Herbicides* containing active ingredients such as fluroxypyr, triclopyr and clopyralid provide useful treatment options. Where thistles are at different growth stages in the pasture, topping 2-3 weeks before spraying is advisable.
Clayton Grazer™ contains 60 g/L clopyralid and 240 g/L triclopyr, providing effective control of thistles alongside docks, nettles, brambles, brome and gorse. It is particularly suited to spot treatment of patches using hand-held sprayers, helping target infestations while reducing overall herbicide use.
Nettles:
Herbicides* containing active ingredients such as fluroxypyr, triclopyr and clopyralid provide good treatment options. Nettles are best controlled when young and actively growing at 15- 25 cm high. Once established, nettles are difficult to control by a single treatment, so regular treatments may be required.
Clayton Grazer™ contains 60 g/L clopyralid and 240 g/L triclopyr, providing an effective option for controlling actively growing nettles while also tackling a range of other common perennial weeds in established grassland.
Newly sown leys:
This is also an important timing for newly established leys. Treating broad-leaved weeds while they are small and actively growing in newly sown leys helps reduce early competition, supports grass establishment and encourages a cleaner, more productive sward for the remainder of the season.
Clayton Flurry™ is a fluroxypyr-based herbicide suitable for both newly sown leys and established grassland, making it a flexible choice across the season. In newly sown leys it provides effective control of chickweed, while in established grassland it controls docks, nettles, brambles and a range of annual broad-leaved weeds.
Where a broader spectrum of weeds is present, Clayton Galley™ offers a triple-active solution containing fluroxypyr, clopyralid and florasulam. Suitable for newly sown and established grassland, it controls a wide range of broad-leaved weeds including buttercups, dandelions, plantains, cleavers, thistles and seedling docks.