Roundup Advanced® Concentrate can be used anytime during the growing season, but it is most effective when applied to young, actively growing weeds, less than 12 cm high. Roundup Advanced® Concentrate works best during warm and dry conditions.

Application during cold weather may delay the appearance of plant damage. If rain falls within 3 hours of treatment, an additional spray may be required. Plant damage will be visible from a few hours to 2 days after spraying. Repeat treatment every 2 to 3 weeks to control new weeds growing from seed and re-growth from bi-annual and perennial weeds.