Potatoes grown in bags

Does anybody have any tips/suggestions on how to get a bumper crop of potatoes grown in a bag. I usually put 4 potatoes in a bag, but don't really get that many potatoes off them.

 

How big a bag?

 

I've got 40l bags and have 5 potatoes in each (followed instructions that came with them). What fertiliser do you use?


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I have 2 x potatoe bags and use Vitax Organic Potatoe Fertiliser.

 

I put a layer of fresh grass cuttings in my bag last year and set the potatoes on this, heard of this on a tv garden prog It worked a treat got a good yield I was surprised, would recommend having a go

 

What kind of Bags is everyone using? I've way too much potatoe seed so want to try and few different methods! Is it just a matter of filling then with compost and fertilise?

 

I just use potatoe/veg sacks you get from B and Q. I grow all sorts in them - potatoes, butternut squash, courgettes, cucumbers etc. I put the seed potatoes on top of 4"/6" of compost mixed with a couple of handfuls of potatoe fertiliser.

 

Going to look a few tomorrow if I can, worth a try and much "safer" I reckon haha

 

Got a couple of tattie bags in our local £ shop two years ago. I use el-cheapo grow bag compost and feed with home brew comfrey fertiliser. I reckon we'll start harvesting about the end of June as bags are in the polytunnel at present.
You need to water regularly as they are thirsty plants.