Looks like a crop forming! I won't be lifting any till the top growth has died right back.
(http://3.bp.blogspot.com/-ojNUhjP_RfA/TtERXx2aUlI/AAAAAAAAAew/tXQOW0zZ9EY/s1600/Oca+25.11.11.jpg)
Looks promising. No sign of frost here yet either, so tubers should have a good chance to swell.
so mine doesn't need earthing up then, as they are growing out of the surface like yours are, robert? i've harvested one tuber and they taste a bit sorrel-like, tho' i think they would be better cooked (any recipes anyone?)
I boil them, but not for too long. Minimal cooking for everything! The only problem when they're on the surface is that they're extremely vulnerable to frost.
Steam them, they only need about 5 mins.
there's also long sprouting shoots on mine too (like the pic) with small tuber-like nodules on, are these to be kept for growing-on for next yr by any chance? would like to cook them in a traditional s.american dish if anyone has a recipe for one.
They look beautiful. I think I will have a try to grow them next year.
Either get some from someone on the site - several of us grow them - or buy some from Realseeds. Tubers should be available in a few weeks. They have a lovely lemony taste. I haven't tried growing on the small nodules, but no doubt it would work.
I had decided not to grow them any more but they had other ideas! Unfortunately although they are growing beautifully, they are right in the way of where I want to put my new fruit trees. Seems a real shame to dig them up when they are doing so well this year.