horseradish

I suppose it may have seeds, but I think it usually comes as roots.

Be aware that it is very very invasive so it is best to grow it in a large pot rather than open ground 

I got a couple of short bits of root (bought online), and planted them in large pots - which are stood on paving slabs to stop them rooting through the pot into the ground below!

Make your horseradish sauce outside - its would be very pungent if you were to do it indoors (probably worth wearing safety specs, you really don't want any going in your eyes ...)

Wilkinsons sell it, saw it in there the other day, was tempted but resisted.  They seem to sell a lot of gardening stuff these days

One of the old boys on our plots kindly gave me a root at the weekend which I popped in a spare corner.......when we say 'invasive'....how bad? I like horseradish but dont want it taking over,is that only likely if you let it seed?

I wish mine was invasive!! Planted a 'thong' 2 years ago and it is well on its way to the subcontinent....