On 2 Jun 2017 11:19, Yellow wrote:
I am growing charlotte potatoes in 11 litre bags on my patio, from
Gardener's World magazine offer, and on the face of it they are doing
really well. But how do I know when they are ready to harvest?

The green part of the plant above the soil is growing vigorously, and is
getting higher every day.

Thanks for any help and advice.

Always say between 10 and 12 weeks from planting if you want new
potatoes. Scrape some soil away and see what's there.

--
Regards
Bob Hobden