Quote:
Originally Posted by mossie
Been a keen gardner for many years was given a lovely blue hydrangea and would like to know how to keep it blue,also still has some faded blue flowers on, should i cut them of now or not,it is simply not a plant i have had in the past .
thanks in advance.
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Hi Mossie, further to the very good advice, you may find the following useful. I grow hydrangeas semi- comercially and add 1 oz of lawn sand to the pot in spring to maintain the blue colour. Now lawn sand contains iron in the form of ferrous sulphate, which will give you a blue flower (depending on the variety) but as has been stated, alluminium will give the best blue and for that, if you have no alluminium sulphate, add half a dozen alluminium roofing felt tacks per pot (in the soil) which will last several seasons.
best wishes, Lannerman.