Particularly vulnerable to frost at this time are the young sprouting shoots on your exhibition potatoes, do make sure that they are well protected.
The problem with potatoes is that they can not be covered over with anything dark for too long as you want the emerging shoots to be green, strong and sturdy and this can only be achieved through allowing plenty of light to get at the shoots. My leeks are progressing along nicely and will soon be ready to be moved on into 6 inch pots as the roots are already well wrapped around the 4 inch pot. Leeks are undoubtedly hungry plants when actively growing so the mixture this time will contain more soil than previous and is as follows – 4 parts of Levington M3, 3 parts of soil sieved from last years leek beds.