In general terms, if the daytime temperature is lower than 60° F, it means that the soil temperature will be lower than 50° F. In this case, it's probably too cold for you to plant lawn seeds. If there is still a chance of frost outside, then it is definitely too cold to plant lawn seeds. Keep in mind that by sowing seeds directly into the ground, weed seeds also germinate at that precise time.
Yes, technically you can sow some seeds incredibly early, that is, they will survive cold, damp soils better than most. I have found that resisting that urge to plant as soon as possible has resulted in higher and faster germination rates and a noticeable reduction in weeding. Let other people proclaim, “I've already planted my peas, and you? and know that every day and every degree of soil warming will cause your peas to sprout sooner and, in fact, actually thrive rather than just survive. Because germination (the process by which seeds sprout) occurs below the surface of the soil, sunlight isn't important, but heat is another story.
Seeds germinate best in temperatures between 60 and 75 degrees Fahrenheit. Heat mats can add 10 degrees to air temperature if you're growing seeds in a room that doesn't offer enough heat for plants to germinate. Initial seed mixing is an option, but since you're trying to replicate natural outdoor conditions, you don't need to use a medium that is sterile or as light as needed for indoor seed starting. Read on to discover everything you need to know to get your winter garden off to a strong start, with answers to your questions, as well as step-by-step instructions for growing seeds indoors.
These tools will give you the water outlet that plants need without the water pressure you would get from a watering can or garden hose you use on more mature plants, which can displace the soil and seeds you just planted along with it. Make sure that any compost you use to create your initial seed mix has been heated to 150 degrees Fahrenheit so that seeds and weed diseases are exterminated. If it is mentioned that seeds need to be stratified or scarified, that is another good indicator of a type of seed that will respond well to winter sowing. When you are unsure of a plant's specific needs, refer to the seed package or information provided online to determine what temperature the seeds should be kept at and how much light they need to sprout.
Once the seeds are in the growing medium, you can practically forget about them until they are ready to transplant them into your garden beds. The seasonal cycle of frost, high winds and bitter rains slowly softens the hard cover of the seed, rolls it in the ground, freezes, and then thaws again, until the seed can absorb water and germinate. Follow the instructions on your seed package or the guidelines in the catalog or website, sow your seeds in the prepared containers. You can sow Siberian iris, oriental poppy and arctic daisy seeds and place the containers outdoors until late winter to propagate your own inexpensive garden seedlings.
When you see them in a seed package or in a seed description, you can feel safe to try the winter sowing technique. As another option, you may want to check out the winter planting forum here, as that method requires planting a lot of seeds very early, but in small outdoor containers to germinate and then transplanted to the garden at the right planting time. .