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Now, most germination failure (especially with warm season grass) is because the grass seed was planted too early. Grass seeds have an outer shell (the hull) that prevents germination until conditions are right. Proper soil temperature is a big factor in the success youâll have. For cool season grass, the ideal soil temperature is a minimum of 45-55 degrees (F). For warm season grass, the ideal soil temperature is a minimum of 55-65 degrees (F).
Grass seed will germinate in most conditions. Most species (particularly aggressive species like Red Fescue and Dwarf Perennial Ryegrass) will germinate in more difficult conditions. Ideally, around 2 of top soil is perfect for the newly germinated seeds to establish their root structure in.ow long does it take for grass seed to germinate? (See also How long does it take for seed to grow). Depending on the conditions, you can expect to see some grass seed mixtures germinate quite quickly. If conditions at the time of sowing are perfect, you may see germination is as little as 2-4 days.