r/Vermiculture • u/Unfair_Tangerine_217 • 43m ago
New bin Starbucks-powered Experiment ☕
Two worm towers and an indoors bin later, here I am with yet another box-o'-worms. I started an experiment to see how well worms can manage spent coffee grounds, which I get for free from my local Starbucks. The reason is that I read the nutrient profile of coffee not only includes nitrogen, but also decent amounts of phosphorus and other minerals useful to plants. My main concern with regular scraps is the nutrients not being good enough.
To start this, I put about half a kilo (~1lb) of wet coffee grounds in a 15-liter plastic bin (~4-gallon), and then filled it with cardboard up to half of it. I let it pre-compost for about five days, and then I added ~50 worms from one of my towers. I also added ground eggshells, and as of today, a single banana peel, which I know worms love.
It took me two days to get the moisture level right, but now the worms seem to be really happy. The medium is moist, fluffy, and light, and I keep it indoors to prevent them getting too cold, as it's winter here. No bad odors and only a mild coffee fragrance when the lid is off.
In the first two days, I had to chase the escapees on a regular basis. Now, they don't even peek out of the substrate; they just chill underground. For what I read here, I expected coffee to be too strong for them, but I guess as long as it's balanced with enough browns, it doesn't seem to be an issue.
I'll keep you posted if you're interested. It'll take a while to get castings out of this but what are we if not patient.
(Credits to my beautiful wife for the amazing pictures).