Richard Dye
master brummie
Not familiar with either, based on the above, you need to be careful with both, buddleia and Japanese knotweed!Buddleja
Learn all about Buddleja - choose the best ones to grow, where to buy, where to plant and care advice from RHS expertswww.rhs.org.ukBuddleia | The Wildlife Trusts
Buddleia is a familiar shrub, well-known for its attractiveness to butterflies. It is actually an introduced species, however, that has become naturalised on waste ground, railway cuttings and in towns.www.wildlifetrusts.orgIs Buddleia as bad as Knotweed? - Environment Controls
There are some similarities between Buddleia and Japanese knotweed but can they both cause equal levels of damage? Read the blog to find out.environmentcontrols.co.uk