When to use weedkillers
Weeds can generally be killed at any time of the year. But the best time is when they are growing strongly because they absorb weedkiller more quickly. This is particularly the case with Systemic and Selective weedkillers which rely on activity within the plant for their effectiveness.
Apply liquid weedkillers in calm conditions to minimise the drift of the solution onto wanted plants. Application to the leaves results in weedkiller moving up to the growing points and down to the root tips.
How to use weedkillers
Read and follow the detailed instructions that are clearly printed on every weedkiller pack. Unless you are using a hand sprayer or a Pull & Spray pack, you will need either:
Using a watering can
With a fine rose or a weedkiller sprinkle bar that will give you effective control over where you apply the weedkiller. Remember a separate watering can is advisable if accidental damage to other plants during normal watering is to be avoided.
Using a pressure sprayer
Protect the plants you want to keep by using a sheet of card to screen them from the application. Always read the label to find out which application method (watering can or sprayer) is suitable for the product you want to use. Do not walk across treated areas until dry, to avoid transfer of products onto desired plants.