Three codes cover the trade, and outfits bidding government work should register under all of them: 115310 (support activities for forestry — where mastication and fuels-reduction contracts live), 238910 (site preparation contractors), and 561730 (landscaping services, which sweeps in much vegetation management). Registration on SAM.gov is free and these codes are how solicitations find you.
Mastiff is the one app for forestry mulching and land clearing companies — jobs, density-based quoting, invoicing, equipment, before/after showcases, and directory leads in one login.