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Some seeds will only germinate after hot temperatures during a forest fire which cracks their seed coats; this is a type of physical dormancy. Most common annual vegetables have optimal germination temperatures between 75–90 F (24–32 C), though many species (e.g. radishes or spinach ) can germinate at significantly lower temperatures, as ...
Warm stratification requires temperatures of 15–20 °C (59–68 °F). In many instances, warm stratification followed by cold stratification requirements can also be met by planting the seeds in summer in a mulched bed for expected germination the following spring. Some seeds may not germinate until the second spring. [citation needed]
Some seeds including cocklebur and amaranth germinate only at high temperatures (30C or 86F). Many plants that have seeds that germinate in early to mid summer have thermodormancy and germinate only when the soil temperature is warm. Other seeds need cool soils to germinate, while others like celery are inhibited when soil temperatures are too ...
However, the overall lighting conditions and temperatures in your home are probably most conducive to seed germination in the summer. "Many people report quicker germination when seeds are started ...
The ideal temperature to grow grass seed varies depending on the type of grass you want for your lawn. Cool-season grasses prefer when air temperatures are around 70 to 75 degrees Fahrenheit.
Gifford says before weed seeds germinate, ... apply pre-emergents in early spring before the top two inches of soil reach temperatures between 50 to 55 degrees Fahrenheit for five consecutive days ...
Seed dormancy is defined as a seed failing to germinate under environmental conditions optimal for germination, normally when the environment is at a suitable temperature with proper soil moisture. This true dormancy or innate dormancy is therefore caused by conditions within the seed that prevent germination.
A good rule of thumb is to repot seedlings into bigger containers about 3 to 4 weeks after germination if the seedlings ... Seed packets will usually let you know if your seedlings need repotting ...