Once germinated, the grass will continue to grow at a rate of about 2/3cm per week. The perfect air temperature for spreading warm season grass seed is right around 80-85 degrees (F). This is the percentage of seeds that germinated in lab tests. Grass seed germinates at different rates, depending on various factors such as the grass species, weather, time of year and soil moisture. I know I saw a chart before showing the germination temperatures for cool season grasses (by variety/type), but is there a similar chart that can be used to predict when each type (TTTF, KBG, Fine Fescue, PRG, etc.) If you are seeding in the spring, know that it will take slightly longer for the seeds to germinate. After the grass seed finishes the process of germination, it will start to grow rapidly. Normally this is during September and October. Grass seed that fails to germinate cannot grow into part of a lush green lawn, so it's important to sow seed when conditions are right for germination. Aim to seed early in the season, but wait until daytime temperatures are in the 60 to 75 degree Fahrenheit range. https://www.allotment-garden.org/.../best-temperatures-for-seed-germination Germination – This is the development of a plant from a seed, which won’t happen unless you planted that seed at the right ground temperature. Understanding how fast does grass grow from seed also takes understanding the factors a seed needs to germinate. Your seed has all that it needs to sprout and make its way above ground, except for three important things. This is why it’s typically recommended to seed in the fall. Typically, germination takes between five and 10 days. Follow best practices for planting grass seed, from seed selection and soil testing to proper care during germination and beyond. The fastest grasses to grow from seed are the cool-season grasses. Ensure the correct conditions when you seed your lawn for the best results. The right seed germination temperature, plenty of oxygen, and the right amount of moisture. Moisture and temperature are the two main factors in germination. It germinates best when the soil temperatures are between 50 and 65 degrees. But this year (2016) the soil temperatures remained high through most of September. This roughly corresponds to the optimal soil temperatures for cool-season grass seed germination. Fescue has its preferred temperature range for germination. As it consumes the nutrients in the soil, the grass will grow larger and larger. Keep your grass and soil healthy and positioned for vigorous grass growth, and maintain your new tall fescue at recommended mowing heights of 3 to 4 inches. will return from winter dormancy? The perfect air temperature for spreading cool season grass seed is 60-70 degrees (F). A helpful tip: When choosing your grass seed look for the germination rate on the label. What Germination Requires. 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