Hygrass P is most effective if sprayed when weeds are actively growing. In the first instance use Hygrass P as an overall spray preferably in May or June, but optimum timing depends on the target weed growth stage, and the interval between application and grazing or cutting for silage. Established perennials are best treated when the flower buds are visible, although the product is most effective against docks in the seedling stage or during the early phase of regeneration from shoots.

For maximum effect do not cut, graze, roll or harrow grassland 7 days before or after spraying, and preferably treated crops should be left for at least 14 days to allow the herbicide time to perform. Established perennials are difficult to kill and may not be sufficiently checked by a single season of treatment. A second spray, should be used to treat re-growth in the late summer or autumn, generally between late August and October. For isolated patches of weeds Hygrass P may be used as a spot treatment and should be applied to completely wet the leaf surfaces until run off.

For long term reduction in docks, stinging nettles and thistles, treatment may have to be repeated in the following season.

Spray when growing conditions are good and there is a minimum of wind. DO NOT spray if there is sufficient wind to cause spray drift OR if heavy rain is expected. Avoid drift onto all broad-leaved plants outside the target area. DO NOT graze the crop within one week of spraying as time is needed to allow docks to re-grow prior to treatment. DO NOT use Hygrass P in fields in which clover forms an important part of the sward.

Animals should NOT be allowed to graze grassland for at least 14 days after spraying, and if poisonous weeds such as Ragwort are present then do NOT allow livestock into the field for at least 14 days AND until the foliage has died and become unpalatable. Do NOT cut sprayed field for silage if poisonous weed are present, until all such weeds are dead.