Unknown plants on new allotment

Hi

As new allotment tenants my wife and I have inherited a small but very overgrown site which contains the usual nettles, grasses etc but also some unidentified plants which we are treating as weeds for the cleance programme. One in particular is puzzling  - not come across it before. Tall thick stems with green ovate leaves growing from corms. No flowers to help identify but they grow in clumps about 2 feet high.

any suggestions please?

SDG

Hello SDG and welcome to the site 

I'm with Waddecar!

Pics would make it easier but possibly horseradish, as these would be around the 2` high, and form in clumps from corm, whereas Jeruselum artichokes at this time of year I would expect them to be alot higher and they tend to be only 1 or two stems from a corm