There are reasons hydroseeding works so well and why it produces grass so quickly. The seed is suspended in a nutrient rich 'Slurry Mix" made up of fertilizer, tackifier, water, seed and mulch. The germination cycle is triggered when the seed has contact with the water, thus is why its important to keep grass wet during germination time, about 20 days. The "Slurry Mix" is spread on prepared ground and the mulch layer seals in the moisture, holds the soil in place and acts like a mini-greenhouse effect. This makes an ideal growing media and perfect conditions for grass to grow.
After hydroseeding, your property will have a nice green appearance from the mulch in the spray mix. The grass will begin to germinate in 5 to 7 days depending on soil temperatures, ph levels and moisture.
Hydroseeding is becoming more popular due to its lower cost and faster application times than laying traditional sod.