Just dug up my oca crop. I find them to be really beautiful objects with their intense, luminous colour.
If only I had protected the foliage in time, before mid November when we got 2 days of light frost, they might have bulked up a lot more through this unusually mild December*. Just by putting a few back in each year I've been getting a good supply. They don't seem to be affected by any pests or disease (so far) and are happy to go on growing in the same corner year after year.
* The average daytime temperature on the winter solstice was the same as it was on the summer soltice!