DIY / Grow

How To Start a Seed Flat

Learn how to start seeds indoors and transplant them in early spring to harvest fresh veggies all summer long.

How To Start a Seed Flat

Starting a seed flat is the best way to nurture healthy seedlings. Why else would you start plants from a seed tray? It’s less expensive, you have more variety to choose from, and you get the opportunity to watch¬† the miracle of plants growing from seed to harvest!¬†

Grow your own! Start seeds indoors in trays or “flats.” Transplant in early spring and harvest fresh veggies all summer long.

Success in starting a flat comes with the right tools and materials, and the right conditions for good germination and healthy growth. To start you off right, follow our potting soil recipe of 2 parts compost : 1 part coconut coir (soaked in water and broken up about 15 minutes in advance) : 1 part organic potting soil. If you measure one “part” in this recipe as two trowel scoops, you’ll have enough potting soil for one large seed tray.

Some great choices for indoor seed starting in trays during the winter include lettuces, broccoli, cauliflower, artichokes.


Seed Flat

Materials needed
  • 1 Lightweight gallons bucket
  • 1 Trowel
  • 1 Small bag compost
  • 1 Small bag potting soil
  • 1 Brick coconut coir
  • Water
  • Spray bottle
  • Seed starting tray
  • Masking tape
  • Pen or pencil
  1. Mix all three ingredients (compost, potting soil, coconut coir) in a bucket to make your potting soil.
  2. Fill a large seed flat with your mix so the soil surface is flush with the top of the flat.
  3. Make small indentations in the surface of each pocket and drop about 2 seeds into each groove.
  4. As far as depth goes: a general seed-planting rule of thumb is to plant seeds to a depth about twice the length of the seed, so that small seeds get planted closer to the surface and big seeds get planted deeper.
  5. Cover with a bit more potting mix. Spray with a spray bottle until saturated and set in a sunny window.
  6. Water this way each day.
  7. When seedlings have at least two true leaves, transplant into the garden!