
1) Agricultural terminology 2) Gardening aid
Found on
https://www.crosswordclues.com/clue/hydroseeding

Hydroseeding (or hydraulic mulch seeding, hydro-mulching, hydraseeding) is a planting process that uses a slurry of seed and mulch. The slurry is transported in a tank, either truck- or trailer-mounted and sprayed over prepared ground. Helicopters have been used to cover larger areas. Aircraft application may also be used on burned wilderness area...
Found on
http://en.wikipedia.org/wiki/Hydroseeding
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