Plants, like humans like to pick and choose who they hang around with. They all want their own bit of space and to achieve this some plants release a toxin through their roots directly into the soil which inhibits the growth of competing plants as Mike Thurlow reports.

Grass is the most prolific plant on the planet and is there to be enjoyed rather than become a chore. A well kept lawn with stripes in it will smarten up any area, but organic gardener Mike Thurlow argues whether it is important to eradicate any plant that is not a grass at any cost.