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Because sunlight and soil temperature change throughout the year, there is a narrow window of time you have to plant grass seed to ensure it flourishes. ... Related: 6 Fast-Growing Grass Seeds ...
1. Watch the soil temperatures. If it’s too cold, grass seed won’t germinate. If it’s too hot, the baby grass seeds will pop up, then quickly fry.
The best time to plant grass seed is when grass is actively growing and that depends on where you live: ... They require soil temperatures in the 55 to 65 degree F range to germinate.
Growing degrees (GDs) is defined as the number of temperature degrees above a certain threshold base temperature, which varies among crop species. The base temperature is that temperature below which plant growth is zero. GDs are calculated each day as maximum temperature plus the minimum temperature divided by 2, minus the base temperature.
Warm season grasses only start growth at temperatures above 10 °C (50 °F), and grow fastest when temperatures are between 25 °C (77 °F) and 35 °C (95 °F), with one long growth period over the spring and summer (Huxley 1992). They often go dormant in cooler months, turning shades of tan or brown.
Only recently has commercially valuable and viable seed for St. Augustine become available, so it has typically been propagated by plugs, sprigs, or sod. Once the grass is cultivated, it can propagate on its own. St. Augustine can grow in a wide range of soil types with a pH between 5.0 and 8.5. It usually blooms in spring and summer.