Posted: 16/12/2013 at 08:55
Lot of mis-information on Knotweed on here.
There are no notifiable plants in the UK - The Plant Health Act 1967 legislates for 'problem plants'
The Wildlife and Countryside Act 1981 states that it is an offence to "plant or otherwise cause to grow in the wild" any plant listed in Schedule nine, Part II of the Act. That list includes Japanese Knotweed. You can grow it in your garden but cannot grow it outside of a garden nor put any cuttings into the council recycling etc.
Japanese Knotweed is not difficult to eradiacate if you control it. Assiduously removing shoots kills it. Some people are lazy and let it grow and spread.
If you have Japanese Knotweed then do not send it to the RHS or anyone else. Contact your local authority and ask them for advice.