As the days begin to lengthen and the promise of spring fills the air, now is the perfect time to start your tomato and herb seeds indoors. While crops like peppers and brassicas need an early head start, tomatoes and many herbs mature more quickly and can be started a few weeks later. Starting seeds indoors not only gives you a jump on the growing season, but also opens up a world of variety—especially ones you might not find as plants in local stores.
Why Start Seeds Indoors?
Starting seeds indoors gives you control over growing conditions, allows you to extend your growing season, and gives you access to a broader selection of unique and heirloom varieties. It’s an especially great option here in Iowa, where the outdoor growing season can be short and unpredictable.
Seed Starting Tips for Tomatoes and Herbs
1. Timing is Everything
For Central Iowa gardeners, late February through mid-March is the sweet spot for starting tomato and herb seeds indoors. This timing ensures that your seedlings will be ready for transplanting after the last frost, typically around mid-May in the Des Moines area.
2. Use a Good Seed Starting Mix
Choose a light, well-draining seed starting mix rather than regular potting soil. This will provide the right texture and nutrients for delicate seedlings to grow.
3. Provide Plenty of Light
Place seedlings in a south-facing window or use grow lights to ensure they get at least 12-16 hours of light daily. Without enough light, seedlings can become leggy and weak.
4. Keep it Warm
Tomato seeds germinate best between 70-80°F. Use a seedling heat mat if needed to maintain consistent warmth, especially in chilly Iowa basements or windowsills.
5. Don’t Overwater
Overwatering is a common seed-starting mistake. Keep soil moist but not soggy. Use a spray bottle or bottom-watering method to avoid displacing tiny seeds.
6. Thin Your Seedlings
Once your seedlings have developed their first true leaves, thin them to one strong plant per cell or container. This prevents overcrowding and promotes healthier growth.
Troubleshooting Common Issues
Leggy Seedlings: Usually a sign of not enough light. Move them closer to a light source or increase the duration of light exposure.
Damping Off (Sudden Seedling Collapse): Caused by a fungal issue from overly damp conditions. Use sterilized containers and well-draining soil, and don’t overwater.
Poor Germination: Check seed viability and make sure the temperature is warm enough for germination. Old seeds may not sprout well.
Don’t Want to Start from Seed? No Problem!
At Ted Lare Garden Center, we carry a huge variety of tomato and pepper plants, including many unique and heirloom varieties you won’t find at the big box stores. Whether you’re looking for something tried-and-true or want to experiment with a new flavor or color, we’ve got you covered.
Get Growing with Ted Lare Garden Center
Whether you’re starting seeds indoors or waiting to shop our greenhouse this spring, we’re here to support your garden journey. Visit us in Cumming, Iowa—just outside of Des Moines—for expert advice, premium seeds, and everything you need to grow your best garden yet.
Happy seed starting—and see you soon at the garden center!
