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Video by Melissa McGinnis - http://twitter.com/trashtalkin Blog by Joe Laur - http://twitter.com/GreenopolisJoe Boy, Melissa must drink enough coffee to keep a whole neighborhood of Starbucks gong. Or at least she finds enough uses for grounds that throwing them away should never be an option. Theres a lot of interesting things in this video post- from the ant protection that coffee grounds produce to the help for the bloomin flowers. According to Doug Greens Simple Gifts Farm, theres solid evidence that green gardeners should be reusing this waste to resource stream in the garden. The site states that research on slugs and caffeine shows that concentrations of caffeine as low as .01 % reduces feeding by slugs . But those concentrations dont kill. It takes 1-2% caffeine solutions to kill slugs as effectively as the chemicals normally used, but at that strength it can damage plant leaves. Coffee grounds contain about 05% caffeine. So coffee grounds will not kill slugs but can deter them from your plants. Nice. Chases them away without slug murder. How very vegan. And apparently coffee grounds make great mulch, particularly for plants that like acidic soils. The site states that they are acidic with a pH of between 3.0 and 5.0 making them superb for mulching rhododendrons, azalea and other acid loving plants. And you can scatter them thinly all over the rest of your garden as organic soil amendments. You need to add inches of the stuff to change the pH. As Melissa state, worms love coffee grounds and gardeners and gardens love worms! The coffee grounds are food source for the little crawly guys. Doug Green recommends tossing the grounds out daily- dont save them, as they can mold. And they compost very well in your regular compost bin. They are similar to grass clippings in their carbon-to-nitrogen ratio. On top of that the microbes that do the composting will turn the coffee from acidic to a neutral pH. Wont make your compost more acidic. You can read more here. By the way, if youre lucky enough to have a coffee roaster company nearby, like our good friend and Greenopolis Partner Deans Beans, they will often give you the bean chaff the hulls left from the roasting process- make great smelling mulch on flower beds and walkways! So enjoy that cup of Joe in your breakfast garden, and toss the grounds right on the ground. This is one of the few products that you really can throw away!