I filled the gro sack with regular peat based compost to about 6 inches high. In this compost I mixed in some Growmore.
I put the 5 chitted potatoes in the bag as the number 5 would appear on a dice, one in each corner (not too close to the edge) and one in the middle.
I covered the tubers and chits with compost and added a little more Growmore watered well and placed in a sunny spot in the garden.
Each night I would water the potatoes if the compost looked dry.
As the shoots grew through the compost I would add another layer of compost with some more Growmore mixed in. When the compost was about 6 inches from the top of the bag I stopped adding compost to allow plenty of room to water the bag.
Potato leaves get quite big so the bags were spaced out to give them room. Giving them room also reduces the chance of blight as the tops have plenty of air flow.
I continued to water the compost well, not the leaves as this can encourage blight, and gave an occasional liquid feed if there was any left in my can after watering my flowering tubs.
I sprayed with Dithane twice when the weather became humid for protection and the fact that these potato sacks were going to be used on our stand at Hampton Court and the plant had to look good!
I emptied one of the sacks last week when the tops had completely died down and counted 62 potatoes weighing in at 3.5kg (7lb 12oz)!
I must emphasise the importance of feeding, watering regularly, protecting from blight and waiting long enough for the potatoes to grow before you harvest them.
Potato Grow Sacks work extremely well, as long as they are well fed and watered regularly and given plenty of sunshine.
Did you grow potatoes in grow sacks this year? Let us know how your growing went by commenting below.