Coffee grounds are a nitrogen source; they are a green. The code words green
refer to compost ingredients being relatively rich sources of nitrogen
, respectively. Dead brown tree leaves are actually a brown (carbon) source
; brown coffee grounds and tea bags are green (nitrogen) sources
Pine needles are resistant to composting. They're highly acidic, and many of the "compost critters" cannot cope with them. Acid-loving plants, e.g., azaleas, camellias, rhododendrons, may enjoy a light mulching of pine needles, but unless you're making special compost just for these plants, it's probably best to segregate the pine needles.
Cooked rice is a carbohydrate, as are cooked beans. Many gardeners won't put either into a compost pile. I have put both into my compost bin when they've gotten away from me in the fridge. However, rice doesn't get away from me as often, now that I have dogs (been gardening since the early '80s; dogs since '98 ). Dogs are wonderful for taking care of *some* leftovers!
But the...ah..."toxic gas" emitted by canines after consumption of beans
is more than even I want to deal with. So...off to the compost! if I've forgotten about beans and just don't want to make soup (assuming they're still wholesome enough to eat...if not wholesome, they definitely
go to the compost).
I can only imagine how much reading you've done, looking through the threads on greens
. But now you've received an excellent (I hope?) education on compost ingredients.
Sunset Zone 17, USDA Zone 9