I mixed in some peat moss with my soil at planting time, one for acidity and two two help hold water as they get so droopy if they dry out at all that first year. The next spring I used aluminum sulfate and that Fall I mixed in soil sulfur. Since then, about four years ago now, it have been blue....I have added nothing that I can recall since. This year it was very pretty it had some pink blooms and some blue. It was actually really pretty. So in September, fearing the return of pink, I added soil sulfur. I don't know if it will act in the soil fast enough though. Time will tell.
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