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RE: Coffee and Raspberries Make A Good Match...Even Before Eating
I used to grow blueberries years ago. I seem to recall we put spent coffee grinds to increase the acidity. The other option is to use azalea fertilizer (but it isn't natural like coffee). Good luck!
I have the fertilizer for the blueberries we're about to plant but I didn't want to go too acidic - it was sort of a wait-and-see-if-this-makes-a-difference kind of thing. I'd also heard it was easy to burn non-dormant plants with the acid fertilizer and the coffee wouldn't be able to work as fast and so was likely gentler. From what I read, it sounds like spent coffee has a neutral PH, which is why we did fresh grounds.