By Rayclapp
Avon,
United Kingdom 
i have an outdoor plant suddenly come up its growing a few inches in days its brown thick stemmed with green small leaves on top i think it has tubers
2 Jun, 2014
Answers
Hmm, Japanese knotweed? Photo, as B says, would be very helpful
2 Jun, 2014
Your description isn't ringing any bells for me, maybe it will for someone else, but if not, a photograph would be very helpful.
2 Jun, 2014