10 Steps For Planting Seeds Indoors
1. Look at your last frost date (find your Frost Dates here) and check the recommendation for how many weeks before this you should sow your seeds. Varieties like Snapdragons can take upwards of 6-8 weeks to grow before the last frost, whereas varieties like Cosmos and Zinnias should be planted just 3-4 weeks before the last frost date.
2. Seeds with hard shells, such as Milkweed, may need to be cold stratified, scarified or soaked before planting. Learn how to Scarify Seeds here. Learn how to Cold Stratify Seeds here.
3. Add water to your soil and mix it with your hands. You want the soil to be moist enough that it can be formed into a ball, but not too wet that it isn’t solid. If you don't pre-wet the soil mix, you may notice that water simply runs off the top and doesn't soak in as you'd like.
4. Place your soil in your cells (plastic, peat, newspaper, or egg carton). Pack the soil down with your fingers, add more, and pack it down again. You want to make sure the soil is compact and comes almost to the top of your cell.