The craze around coffee grounds in the garden has led to many instances of overuse. While it's definitely not a good idea to dump fresh coffee grounds onto plants
Coffee grounds can range in acidity levels, with some experiments out of the University of Arizona finding pH levels as low as 4.6
With all that said, fresh coffee grounds are an expensive option as fertilizer anyway. Spent coffee grounds are a much more common option
which is very close to neutral and is unlikely to alter the acidity of your soil if you use the grounds in moderation.
Even if you grow alkaline-loving plants, it's okay to incorporate some used grounds in your compost.
If you do perform soil testing and find that the soil surrounding your azaleas or herbs is far too acidic
You can also use agricultural lime from your local hardware store such as Soil Doctor Garden Lime for around $10 from Ace Hardware.
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