dirt dibbler wrote:
I am thinking of planting a row of cheap blueberry bushes on my
allotment,
(snip)

You need to have a ph of 5.5 which is very hard to achieve on the
lotty. I sink my pots in the ground and only use rainwater from my
water butt. I mulch my pots too to keep the moisture in and don't
forget to keep the birds away. I've bought two more blueberries from
Crocus.com at 4.99 each. A bargain and dreaming of crumbles now ;o)