Why are my salad potatoes floury?

[Little Bean]

I am very frustrated as my 'Belle De Fountenay' salad spuds are floury.

I planted them on 5 May in a hole filled with well rotted manure, and watered them sparingly due to very wet May weather.  I then didn't water at all until the July heatwave.  When dug up in late July they were all floury and I had to steam them or else they fell apart.

Was the lack of watering to blame?

[Little Bean]

[Hyacinth]

Mine were too :( 1st time trying them this year & I wasn't impressed. Nothing wrong with my watering/growing medium either. Waiting to hear from experience B de F growers on this one.

[saddad]

I've got a row in the ground which have died back... so not hoping for much from that or my Anya... Dry matter content is what makes a potato floury and split on boiling.. to do with the starch expanding like in Popcorn but on a smaller scale(?)... logic says if it has been so dry the tuber will have less water... the reverse is why so many shop bought huge tubers taste of nothing and the mega yield that new pot vars. have from being constantly watered..
???