I have been told that glyphosate is the best weedkiller to use, when is the best time to use it?

As this weedkiller is systemic, it is important that it is applied to weeds which are actively growing. Avoid using the weedkiller in times of drought or when temperatures are low as the weeds will not be growing efficiently. It may seem a strange concept, but it may be useful to water any areas of weeds a day or so before the application of glyphosate weedkiller to get them growing! The golden rule when using glyphosate weedkiller is ‘The better the weeds are growing, the better the product will work!’