I am trying my luck at growing 6 mandarin orange trees from seed inside my home. So far they seem to be doing good, the tallest one is about 24 inches and the smallest is about 18 inches. And I got the seeds from some seedless Mandarin oranges LOL.
it is generally considered to be a good thing to add coffee grounds to a compost pile
specifically for citrus, it is also found to be a good thing because it helps bring the pH of the soil down ONLY IF your soil pH is too basic. The tree will not thrive if the soil is too acid, so I would recommend getting a pH strip to test your soil first.
if your soil is too basic (pH of 7 or more) then you can use coffee grounds as mulch lying it on top of the soil in which your trees are, making sure that there's at least a 12- inch ring wide of space separating the mulch from the trunk - you never want your mulch close to your trunk to prevent mold, decay
if your soil is already fairly acidic or you just don't want to bother with all that, I would recommend just using normal mulch (barks, leaves, moss) and using the coffee to start a compost pile alongside your vegetable wastes.
more info on citrus trees here homeguides.sfgate.com/
If your trees are 24 and 18 inches then it sounds like you may have the beginning of a "green thumb". Just so you know - a cactus is easy to kill
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Can you give a Lemon and Lime tree coffee grounds? How do I know if a plant likes acidic soil?
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.