Published: March 1, 2026
Howdy from the Seed Tray Table, Farm Mamas
It’s the first of March, the days are lengthening, and the kitchen windowsill is turning into a mini greenhouse again.
After more than a decade of country living and sustainable farming on our Michigan homestead, early spring seed starting is one of my favorite rituals. First, it lets us dream big about the garden while the ground is still thawing. Next, it gives tender crops a head start before the last frost. Finally, it’s a zero-waste way to reuse trays and soil from last year.
Today I’m sharing a complete guide to early spring seed starting, including how to time planting with lunar phases, best seeds for cold frames and greenhouses, and how to keep everything thriving indoors until the last frost passes. Let’s get those trays going — grab your seeds and let’s bring spring inside early.
Why Early Spring Seed Starting Matters
First, starting indoors 6–8 weeks before the last frost (Michigan average around mid-May) beats the season. In addition, lunar timing can boost stronger growth. For example, planting above-ground crops during the waxing moon directs energy upward. As a result, you get healthier seedlings. Finally, it’s a zero-waste method that reuses trays, soil, and pots from last year.
My Michigan Timeline
- Last frost: around mid-May
- Start indoors: March 1–April 15
- Harden off: mid-April to early May
- Transplant: mid-May onward
Lunar Phase Planting Basics
First, understand the phases. Next, use them as a guide. For example, the waxing moon (growing light) is ideal for above-ground crops like leafy greens, herbs, tomatoes, and peppers. Then, the waning moon (decreasing light) is better for root crops like carrots, beets, and potatoes. Finally, rest and plan on the new moon.
March 2026 Lunar Phases (for reference)
- New Moon: March 3
- First Quarter: March 11
- Full Moon: March 18
- Last Quarter: March 25
Best March starts: Waxing moon (March 4–17) for leafy greens and herbs, waning moon (March 19–31) for roots.
Best Crops to Start Indoors in Early March
| Crop | Start Date | Days to Transplant | Lunar Preference | Notes |
| Tomatoes | March 1–15 | 6–8 weeks | Waxing | Need heat mat |
| Peppers | March 1–15 | 8–10 weeks | Waxing | Slow germinators |
| Lettuce | March 15–31 | 4–6 weeks | Waxing | Succession plant |
| Basil | March 15–31 | 4–6 weeks | Waxing | Loves warmth |
| Onions | March 1–15 | 8–10 weeks | Waning | Long season |
Farm Hack: Start extras for the chickens — they love seedlings.
Step-by-Step Indoor Seed Starting Guide
First, gather your materials. Next, follow these steps.
Materials
- Seed trays or pots
- Seed-starting mix
- Heat mat (optional)
- Grow lights or sunny window
- Watering can
Steps
- Choose Seeds: Use organic or saved seeds from last year.
- Fill Trays: Moisten seed-starting mix to ½” below rim.
- Plant: Follow packet depth (usually ¼–½”).
- Label: Use laser-engraved slate markers.
- Cover & Warm: Add plastic dome or bag for humidity. Use heat mat if needed.
- Light: Provide 14–16 hours/day under grow lights or bright window.
- Water: Bottom water to avoid damping-off.
- Thin: Keep the strongest seedling per cell.
- Harden Off: Start 7–10 days before transplant.
Troubleshooting
- Leggy seedlings? → More light.
- Mold? → Less water, better airflow.
- Slow germination? → Warmer spot or heat mat.
Lunar Phase Tips for Success
In addition, timing with the moon can help. For example, sow leafy greens during the waxing moon for upward energy. Then, plant roots during the waning moon for downward growth. Finally, rest on the new moon.
Shop the Seed Starting Pairing
- Custom Slate Plant Marker
- Muscle & Joint Salve
- Bumps & Bruises Salve –
Shop Now →
Parent Tips
- Let kids plant seeds — great fine motor skill fun.
All printables are free images in the blog post. Generic version for your family to personalize and print.
A few of the items we mention link to things we actually use around the farm. Buying through those links sends a little support our way at no extra cost to you — thank you for helping keep Lange Girl Farms going!
Some links are affiliate links — I earn a small commission at no extra cost to you.
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