I've been a fan of collecting Free Fertilizers for some time now.
My two favorite Free Fertilizers are the first two...I get buckets of them at a time:
* Coffee Grounds...try Starbucks...or I get mine also from a local Pancake house. They are irresistable to Earthworms.
* Eggshells...instant calcium.
* Wood Ash...who has a fireplace that you know?
* Sawdust (Sawdust and Wood Ash are very alkaline...so mix with Acidic fertilizers if necessary like Coffee Grounds)
* Grass Clippings... a never ending supply from neighbors...and what a great mulch to conserve moisture.
* Tree Chips.I get truckloads of this Free from Tree removal folks. Let it rot & 'Heat up' in a pile for quik fertilizer.
* Autumn Leaves....up North...and Midwest and Northeast and Northwest... Shred them first for a quicker release.
* Fish heads and entrails...local Seafood markets. Get Shrimp casings too.
* Compost...make your own and save those kitchen scraps.
* Seaweed...if you are lucky enough to be near the beach.
* Mussel and small clam shells like the Cherrystones. Chop them up with a shovel as you are burying in the garden.
* Straw...from a construction business...or Highway crew...
* Slage or compost...many counties provide this for free....
* Pine Needles...have a nearby Pine forest?
* Horse manure from nearby stables.
Well, you get the idea. I like Organic gardening, so with a few tweaks Organic works too. Like only getting grass clippings from neighbors that don't put chemicals on their lawns. But most of this list can be organic with paying some attention to details. Earthworms LOVE most of this stuff...so they multiply like crazy and leave their fertile castings behind. You know what that is? MORE FREE FERTILIZER.
Fiery Regards and Great Gardening,
Pepper Joe