I am a beginner-ish. I have been trying to grow first early Anya and Pink Fir Apple potato for the last 2 seasons in raised beds. Can anyone shed some light on why each plant puts on a huge (more than 8 foot long) top like a triffid, yet there are hardly any potato tubers below ground. I have tried lifting at 100, 120 and 140 days. The tops don't like to turn yellow either, keeping their green till the death (or I get fed up and I pull them up). The only success I had was in 2 tubs where the tops where more limited and there were reasonable tubers at 100-ish days.
Any ideas would be very welcome....
Thanks in advance.
MW