Posted: 29/05/2015 at 20:39
Fertiliser should have been in the compost or soil before you planted. Don't let them dry out. Potatoes in bags use a lot of water. If you want early potatoes, have a ferret around in the bag, removing the bigger ones as you go. If the tops start dying off, or they have flowered, the tubers are usually ready and you can tip the lot out.