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Weed Killing Frequently Asked Questions

All the Roundup facts rounded up

This is the place to find out all you need to know about Roundup. Want to know whether Roundup kills moss? Want to know how Roundup could affect your lawn? Get all the answers right here.

Why aren’t my weeds dead yet?

This is all to do with the way Roundup gets to work on weeds. The weed may look healthy still on the outside, but rest assured the plant is dying on the inside. Roundup’s systemic action sees the weed killer moving down through the plant to kill the roots. Usually, within two weeks, the leaf tips will start to wilt and turn brown. Roundup works faster when weeds are actively growing. If weeds are not growing vigourously (e.g. in cold weather, or if the plant is stressed by drought), the process may take up to 4 weeks.

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

When can I replant/reseed after use?

Why have weeds re-grown after several weeks?

Will it kill grass?

Why has it killed the grass?

Will it kill moss or algae?

Will it kill ivy?

Will it kill tough weeds such as Creeping Lantana?

Can it be used on paving?

Does it harm the soil, persist in the soil, poison ground etc..?

How long does it need before rainfall?

Difference between Ready to Use & Concentrate?

Does the Concentrate need using up straight away after mixing?

Can I put it on stronger? Will that work better?

What are the origins of Roundup?

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