What do I add to hydrangeas to turn blue?
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nitrogen.
Nitrogen
https://www.espoma.com/landscaping/how-to-turn-pink-hydrangeas-blue/
tin can or iron nail
copper
If it was originally blue, they like acidic soil, they have fertilizer for each color available most everywhere that should keep it the color it was meant to be. If it wasn't blue originally, it will not turn blue. Pink and while don't like added acid. Follow the directions and it should be fine. Make sure you use it well before the flowers form so that it will reach the blooms in time.
with another thought test you soil for the ph level