Property owners sit on acorns, seed pods, and yard waste every year that just gets raked up and thrown out. Landscapers and gutter-cleaning crews haul away the same thing. This is a simple way to turn that into small cash instead of a landfill trip.
"Big oak, drops a ton of acorns every fall" or "row of maples along the drive" is enough to start — species ID and exact counts aren't required up front.
Timed to the species' drop window. You're not doing the labor unless you want to.
Compensation scales with volume and species demand — an oak that's feeding a mailing run or a greenhouse order is worth more than scattered odds and ends.
The flip side of the marketplace: growers, hobbyists, and small agricultural buyers post what they want, at what price, with mailing/handling terms attached — the same way someone might post a job. A grower with a windowsill full of sprouted avocado pits or a batch of tomato seedlings that outgrew their pots can fill part of an order instead of composting the extra.
The instinct to use an NFT or a contract for "this specific batch of seedlings, these terms, this price" is really just wanting a clear, findable, trackable listing. A plain marketplace listing with clear terms does that job without needing crypto-specific infrastructure — NFTs stay optional, for whoever specifically wants that receipt format.
Peach pits, pineapple tops, avocado pits, flower seed from someone's specific garden, herb cuttings — anything with a "someone will pay for this instead of it going in the trash" angle fits the same listing system as acorns and maple seed.
Not a day-one feature — a direction to grow into as volume justifies it.