Back in late February, I planted four single tubers in black pots with the aim of harvesting one pot a week in the month of June.
This week saw the first Blight Alert issued, courtesy of 2 days of unusually warm and wet conditions.
This morning I saw the odd brown patch on the odd leaf, so I did a test harvest of one pot to see if the crop was ready.
1.92lb from just over 30 tubers.
About five minitubers had not developed fully, suggesting continuing growth would have increased yield, however in general, the size of the first early potatoes was perfect.
Having sown around 25th February, a harvest on 19th May is an 83 day harvest, a day shy of 12 weeks.
The pots were kept inside until shoots emerged around the spring equinox, after which they lived happily outside (as we did not have a single frost from then on).
The conclusion is that new potatoes can be eaten in May in NW London, provided the pots remain indoors for four weeks to initiate growth.