A warm-weather jump on seed starting
UNIVERSITY OF MINNESOTA EXTENSION - www.extension.umn.edu
With this week’s unusually warm weather and an above-average forecast ahead, it’s no surprise gardeners are eager to kick off spring.
One of the easiest and most rewarding ways to jump-start gardening is to start seeds indoors. It’s simple, affordable, and gives long-season veggies and annual flowers the head start they need to thrive.
Even if your yard still looks like February, your home is the perfect place to give your garden an early boost. A few lights, a handful of seeds, and an hour of prep can bring spring a little closer, no matter what the thermometer says.
Why start seeds indoors?
- You’ll find more seed varieties than you’ll ever find as nursery transplants, including heirlooms, unusual colors, and fun shapes.
- It’s budget-friendly: one packet = many plants.
Seeds germinate better when fresh, so buy only what you need or split orders with friends.
Seed-starter supply list
- Seed packets
- Seed-starting tray with drainage
- Waterproof tray/boot tray for bottom-watering
- Sterile seed-starting mix
- Spray bottle
- 5000K LED or fluorescent lights
- Adjustable shelf or light stand
- Heat mat (optional)
- Plant labels + marker
- Small fan for gentle airflow
Seed-starting basics
Place a grow light strip inches from the top of the seedlings.
Healthy seedlings need:
- Sterile, lightweight seed-starting mix
- Gentle moisture, best applied with a spray bottle
- Steady warmth around 60–70°F
- Optional heat mats for warmth-loving seeds
Choose the right indoor spot
Skip the windowsill; it’s too drafty, sunny, chilly, and inconsistent. Instead, use a basement or spare room with stable temperatures, electrical outlets for lighting, and space for trays and shelves.
Keep grow-lights close to seedlings to prevent stretching.
After sprouting
Once you see green:
- Ensure you have bright, consistent light: keep the lights just above the leaves.
- Water lightly and regularly. Keep soil moist but never soggy.
- Harden off seedlings to prevent shock when they move outdoors (don’t skip this step!):
- Start with a couple of hours outside in the shade.
- Add more time and light over 7 to 10 days.
Read more about starting seeds indoors.
