Pennards Plants will be in residence with 80 plus varieties of seed potatoes for sale by the single tuber with some unusual and rare varieties not often seen.
Advice on choice of varieties will be available and cultural help too.
An ideal opportunity for Londoners to stock up with their kitchen garden needs for the season all in one place.
There will be potato printing for children with printed tea towels to take away.
The cafe will serve a "potato-friendly" menu on the day.