Is there a household ingredient to keep hydranges blue?
by
Barb Gamble
+4
The internet says the soil needs aluminum sulphate to keep hydranges blue. Will epsom salts do the trick, or do I need to go out and actually buy aluminum sulphate?
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You need an acid fertilizer usually the type used for evergreens.
https://www.wikihow.com/Keep-Blue-Hydrangeas-Blue
http://vinegartips.com/2015/06/08/think-pink-blue/
http://homeguides.sfgate.com/hydrangeas-coffee-grounds-43622.html
You're welcome!