Gardening in Ann Arbor
Downtown Home & Garden (formerly Hertler's) sells garden supplies downtown, as do numerous other shops.
The City of Ann Arbor's Solid Waste department has a Materials Recovery Facility Drop-Off Station where you can buy bushels of mulch and compost.
Disposal
There is free curbside pickup of compostable materials on your trash day -- just leave your compostables at the curb in a labeled trash container (stickers are avaiable free from the city) or in lawn-leaf bags. Trash bags are not accepted. Bundle branches that are less than 6 inches thick into 3-4 foot long piles.
Leave your grass clippings on the lawn -- it's good compost!