My son's garden is being over-run with a weed that he is unable to identify. It has a thick, long taproot which is quite white in colour and a leaf shaped a little like a water lily. Any advice on how to get rid of it would be welcome preferably without using weed killers.
Thanks for all your suggestions. From memory it looks most like petasites. I will send the link to my son.
Many thanks everybody and have a happy New Year.