Best Practices for Early Season Seedling Propagation
I love this time of year. Outside the snow is still piling up, but inside we’re sowing seeds. It feels like a giddy secret—the smell of soil, the germinating seeds and the unfurling of true leaves, while outside the plow is rumbling down the road and every non-farmer is wondering how long winter will last. Okay, every farmer is wondering how long winter will last, too, but at least we’ve got a jump start of the feeling of spring. Early season seedling propagation is more than just a way to beat the winter cold, of course. It’s a way to jump start the harvest season, and to be ready to hit the ground growing once the snows melt and the fields dry. As you start your seedlings, keep these best practices in mind. Factors Affecting Germination
- Seed condition
- Start with viable seed. Some seeds, like alliums, lose viability quickly, while many other types will remain viable for years in proper storage. If you’re using older seed, consider doing a simple home germination test using the paper towel method.
- Think Goldilocks when it comes to water: not too much, not too little. Too much water can cause the seed to rot. With too little water, it won’t sprout at all. Or worse, if the seed begins to germinate and then dries out, it will die. During the germination phase, it’s important to have consistent moisture. To avoid overwatering and drying out, cover the moist soil with a plastic dome, wet paper towel, or tray. Check on the flats a few times a day and mist with a misting nozzle or spray bottle when needed.
- Seeds need oxygen to germinate. This is one reason you want to avoid over-watering, since waterlogged soil doesn’t allow for proper airflow.
- Most crops germinate best in soil that is 75º-90º F. Consistent and appropriate soil temperatures will ensure quick germination. Check the growing recommendations for each crop to find out the ideal temperature, and use heat mats to efficiently warm the soil without having to heat the air as much.
- Good soil matters, and will set the foundation for healthy growing. Start your seeds in an organic potting soil mix like Vermont Compost Company’s Fort Vee (great for soil blocks) or Fort Light (great for smaller celled trays). At Good Heart Farmstead, we start all our seedlings in Fort Vee.
- Most vegetable seeds don’t need light to germinate. Once the seeds have germinated, remove any covering (paper towels, plastic dome, or tray) and immediately set under light. It’s important that sprouts get immediate access to light. If they don’t, they’ll get leggy as they stretch and search for it.