Answer: Although vinegar is acidic, there have been no studies done as to how a vinegar solution might affect plants over the long term. Vinegar doesn't last very long in the soil - only a few days - so you'd need to mix a new vinegar solution each time you watered your azaleas. I think I'd stick with peat moss and the acidified Azalea/Rhodendron fertilizers available at garden centers. If you decide to experiment with vinegar, 2 tablespoons diluted in 5 gallons of water is the ratio. Best wishes with your azaleas!
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