Poor spud yield

Bit diappointed with our Duke of Yorks 

Dug first lot today and only got about 12 potatoes from 3 plants....what have we done wrong...any thoughts?

Cannot help with this years but I had the same last year.
Poor crop from all 3 varieties I put in.
They all grew a lot of greenery and very little potatoes.

I have given up with putting them in the ground as I find that planting 3 potatoes in a large pot has given me better yields. Recently saw a very large tub in Wilkinsons that I am planning to try next year - bigger and cheaper.

This year I planted up 4 large pots and have been pulling potatoes up for the last couple of weeks. May try and get some potatoes to plant for a Christmas crop in one of the pots.

The used compost gets tipped on to whichever patch of ground looks most in need after they are finished.

I got a great yield from using Charlotte - incredible!  Others' on our plot site also seem to have done well with Charlotte - not sure what is different about them over other varieties, but the weather in York has been almost perfect for spuds this year.   

I've had a good crop from my Lady Christl and they were so tasty and slightly sweet. I have watered all my veg well this year as my OH has given me stick for not doing enough before. I have raised beds and it's surprising how much they dry out in a day. Until now, I have planted my pots quite deep but this year they were planted more shallowly as I have reclaimed farmland and the soil is silty and tends to water log so I get rot and slug damage. I earthed up as usual but didn't have to dig so deep for the tubers. Also, there was no slug damage. Other pots to come are Sharpe's Express and Golden Wonder later on. See if the slugs go for them later. Sprayed for blight in advance - can't do anymore except pray!

Vivaldi did not do great for me this year, but I was panicking for my maincrop (KE) when I saw some dodgy foliage and just pulled the vivaldi.  They tasted great and we had two meals from them (from 5 seed pots) so will put that down to my inexperience and will grow again next year

I have been very impressed with my Lady Crystal which were a mistake on the part of the company by sending the wrong ones but I'm sooo glad they did!

I'm getting jacket tatie sized tubers from them now as they should have all been dug up long before now!

Can't really comment on why yours aren't performing well but as Yorkie said there could be any reason as to why they haven't done as well as others... 

Mine were the red duke of york, and i wasn't impressed either. Got better yields from charlotte  and vivaldi (2nds)

I will second that, I am just going to do charlottes next year, as they never let me down (so far).  Well thats the plan but I may weaken by the time next March comes.  This was the first time I planted DOY's