[Mark Wiltshire]

I have this year gone no dig, I put on 5” of mushroom compost.

I planted Foremost earlier which have flowered but when I dig them up the seed pot oats was still solid and no actual potatoes were growing.

The plants were otherwise very healthy. The second early Jazzy & Charlotte appear to have good sized tubers formed.

Does any body have any possible explanation?

Many thanks

[mumofstig]

Too dry at tuber initiation stage?

Tuber Initiation

The tubers begin forming at the stolon tips of the potato plant, but they are not yet enlarging at this stage. The stolon tips are the underground stems and most of the potato mass lies 18 to 24 inches below the soil surface. The shallow location of the tubers means that sufficient water is very important to healthy potato growth. Along with watering, photosynthesis continues to nourish the plant and nutrients are stored in these early tubers in preparation for the next stage, when they begin to bulk up. This tuber initiation period will last for about 2 weeks. For most potato varieties, this is the period when the plant also begins to flower.

https://homeguides.sfgate.com/potato-growth-cycles-72695.html