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When to Use Roundup Weedkiller

It is important to choose the right time to apply weedkiller to achieve the best results.

Check the weather forecast

Choose a calm, dry day to apply your Roundup when the temperature is between 12°C and 25°C.

  • Don’t apply when it’s windy
    Drift may damage plants that you don’t want to kill
  • Don’t apply when it’s raining.
    If it should rain within 6 hours of application repeat treatment may be necessary
  • Don’t apply in very cold conditions
  • Don’t apply in very hot conditions

Ensure that you apply Roundup to the leaves

It is important to ensure that you spray the entire leaf, but try to avoid run off.

The best time to apply is when the leaves are green and growing, typically in the spring and summer.

When can my children/pets return to the treated area?

When Roundup has been absorbed by the leaf, the residue will dry. When the residue has dried, children and pets can be allowed back onto the treated areas.

Can Roundup kill Japanese Knotweed?

Yes, but you will need to use Roundup Tree Stump & Root Killer. It may take several applications – please read the label for further advice.

When can I replant/reseed after use?

Roundup is only active in plants and is inactivated on contact with the soil. It is then broken down by soil micro organisms so that you can re-use the soil for re-planting. We recommend that you leave treated weeds for about 7 days before digging or cultivating the soil to allow Roundup to move to the roots of the weed.

Video Guides

Using Roundup is so simple. But, don't just take our word for it - have a look at our easy to follow video guides.

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