Hydroseeding or hydromulching (same-same) is a process where mulch is mixed with seed, fertilizer, tacktifier (glue) and soil amendments to create a slurry that is sprayed onto bare soil. This process enables seeds to rapidly germinate and grow while the mulch keeps the soil and seed in place (limiting erosion and increasing seedling survival). The largest benefits of hydroseeding are limiting erosion, followed closely by increasing seed germination and accelerated germination. While these #'s may not be "scientific", my guess is that you get about 40-50% more seeds to germinate with hydroseeding than you get with hand seeding or using blown straw mulch, and germination at a faster time line.
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