Plants Dying

Question

I am attempting to grow early cabbage plants in a pot on my kitchen windowsill. Germination is good and they grow to about 4 cm., then rot at ground level and die. Why is this?

Answer 1

Sounds like a damping off problem. This article should help you with that: https://www.gardeningknowhow.com/garden-how-to/seeds/what-is-damping-off.htm