Love them or hate them, you have to admire their march across the globe. Second only to McDonalds for reach across the world. Their premium brand image with a price tag to match is often in a juxter position to their local innitiatives. Today in the closest Starbucks to work I got something for free. OK, pick yourself up off the floor. Yes I really did get something for free. "Grounds For Your Garden"
Coffee grounds are a nutritional additive for your soil. During the brewing process most of the acidity is removed, leaving used grounds with an average ph of 6.9 and a carbon-nitrogen ratio of 20-1.
Directions: Add grounds directly to your garden... Apply this "green" material as a side dressing to nitrogen loving plants, including most perennials and allium plants. Balance the nutrition of your soil with "brown" materials such as leaves or dried grass.
Or to your compost Combine with "brown" materials in your compost pile.
Use grounds within 2-3 weeks of brewing to capture the most nutritional value.
So I have a bag and I'll let you know what the wife thinks and also her father. He used to work for the Royal Horticultural Society at Wisley.
More info from Starbucks website.