Starting seeds indoors is a great way to get a jumpstart on the growing season, especially in colder climates when outdoor planting comes later in the spring. With a simple setup and the right conditions, you can grow healthy seedlings ready for the garden. Jenn Nawada shares a few key tips to help you get started.
Start in Trays
Use seed-starting trays instead of large pots. Seed trays help you:
- Save space
- Keep seedlings organized
- Control moisture levels to prevent root rot
- Many seed trays also include drainage holes and humidity domes, which help create the ideal environment for germination.
Seedling Mix is Key
Seed-starting mix is lighter and finer than standard potting soil, making it ideal for delicate seedlings. Most seed-starting mixes contain ingredients like:
- Peat moss or coconut coir
- Perlite or vermiculite
These materials help retain moisture while still allowing for good drainage. Unlike potting soil, seed-starting mix typically does not contain fertilizer, which helps prevent burning young seedlings. Once seedlings develop their first true leaves, you can begin feeding them with a diluted fertilizer if needed.
Use a Heating Mat
Many seeds germinate best in warm soil. A seed-starting heat mat placed under your trays helps maintain consistent soil temperatures and encourages faster, more reliable germination.
Once the seeds sprout, the heat mat can usually be removed.
Provide Proper Light
Strong light is essential for healthy seedlings. Without enough light, seedlings become tall and leggy as they stretch toward the light source.
You don’t necessarily need UV lights—standard LED or fluorescent grow lights work well. Position lights just a few inches above the seedlings and adjust them as the plants grow. Keeping the lights close helps promote compact, sturdy growth.
Aim to provide about 12–16 hours of light per day for most seedlings.
Keep Timing in Mind
Knowing when to start your seeds is key to success. Check the seed packet for recommended timing, which is typically listed as the number of weeks before the last frost date.
- To determine when to plant:
- Find your area’s average last frost date
- Check how many weeks early the seeds should be started
- Count backward to determine your start date
Each plant has different timing requirements, so be sure to check every seed packet before planting.
