From Fiona Taylor
When listing the means of escape of plant species (19 March, p 18), Andy Coghlan apparently overlooked one of the most obvious: the steady flow of keen gardeners pinching a bit off, with the delicious challenge of trying to root it at home. I know that I am not alone in having memories of seeing respectable people surreptitiously stuffing broken-off bits of greenery or seeds into their bags.
Guildford, Surrey, UK
