I bought three beautiful blue "Endless Summer" hydrangea plants from the Farmers Market
last month, and even though I spread lots of Aluminum Sulphate on the soil around them when
we planted them, as the stallholder told me to, to keep them blue, the flowers have already
changed to various shades of pink, mauve, purple - hardly any sign of the beautiful
blue any more, except in the centre as you can see here! :((
Does anyone have any ideas what else I can try to get them to turn blue???