I'v been trying this as well, it is a crop that is planted on the shortest day and picked on the longest, so they say, I never had any thing back out from them (yet) but I'll keep trying, mine are doing the same now but do not look dead so I suppose I should pull one up next week and see what I'v got (or not)......

I put mine in last October and have had to harvest them as they were ready but they are rather small, I think because the soil is poor.