Weed Destroyer RTU should only be applied to actively growing weeds. Rain or irrigation within 6 hours of application can reduce the efficacy of Weed destroyer RTU. The visible effect on treated foliage usually appears at 7-10 days after treatment but may vary according to weather conditions. Do not spray on weed foliage covered with a layer of dust. In these situations, apply after recent rain or irrigation. Do not apply to weeds that are covered with dew, or in a dormant growth phase or under stress conditions.Perennial weeds must be sprayed upon flower initiation or between mid-summer to early autumn. Certain perennial weeds may require follow up spraying onto regrowth. The product has a minimum concentration of 1.6% with shelf life of 2years. Apply Weed destroyer RTU up to the point of run-off, to bradleaf weeds and unwanted grasses e.g Kikuyu, Kweek around lawn and garden boarders, paths, patios, rockeries and driveways. Hardier weeds will need a follow-up treatment after a week or two after re-growth are noticed.