Weedkiller for gardens Pump N Go 5 litres. Roundup Weedkiller is the Worlds best selling herbicide, used in gardens everywhere. ROUNDUP® is a weed killer that kills the root of the plant so that weeds never come backROUNDUP® FAST Ready to Use Pump N Go 5.0LWeedkillerThe Scotts Company (UK)ROUNDUP® FAST Ready to Use Pump N Go 5.0L