Citrus do like a bit of acid soil, and are heavy feeders, meaning they use high N, as well as some P in the NPK mixes sold. Coffee grounds are probably good every 1-2 months now and 2-3 months when cooler, and are a good mulch near the trunk if dried. People, never toss coffee or tea leftovers, or even stale drinks! Gardens love that, and so do worms. By the way, some soil organisms love sugary things, so don't send sodas down the drain unless you're cleaning it- they're good for that too, though not for drinking.
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