Best place to get aluminium sulphate plant food

coolagarry
coolagarry Posts: 1,261 Forumite
Part of the Furniture 1,000 Posts Combo Breaker
edited 11 August 2009 at 3:34PM in Gardening
I would like to keep my hydrangeas blue and I understand that the best way is annually alternating its feed between aluminium sulphate and Sequestered Iron.
Wilko's etc sell Sequestered Iron but I can't seem to find aluminium sulphate. Anyone got any ideas?
(It's a bit expensive online because of postage)
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