How to Start Seeds Indoors

easyGardeningVariable based on crop

Safety Warnings

Small trays — For sowing seeds

Boxes — For early starting under cover

Ruler or stick — To open creases in boxes for seeds

Biodegradable pots — For easy transplanting

Seeds — Appropriate for indoor starting(As needed)

Boards or matting — For nighttime cover(As needed)

Select seeds that require a longer growing season than the local outdoor environment provides (e.g., tomatoes, eggplants, peppers).

Tip: Test seed germination by placing them on a moist cloth between plates.

Prepare containers such as small trays, berry-boxes, or biodegradable pots.

Tip: Biodegradable pots allow for transplanting the entire pot to avoid root disturbance.

Sow seeds in the containers; for example, tomatoes should be sown 1/2 inch deep.

Tip: Soak seeds in water overnight before planting to speed germination.

Place boxes or trays in a sheltered position on the warm side of a building or in a greenhouse.

Tip: Cover boxes with boards or matting at night to retain warmth.

Monitor temperatures and bring boxes inside during very cold spells.

Tip: A temperature of 70°F is optimum for maximum germination in some species.

Water carefully to ensure the soil is not packed by the force of the water.

Tip: Maintain moisture without flooding the containers.

Thin or transplant the seedlings as soon as they produce their first true leaves.

Tip: Remove weaker plants to allow the strongest to thrive.

Harden off seedlings for one week before transplanting into the ground.

Tip: Start by placing them in the shade for a few hours, gradually increasing sunlight exposure daily.

Transplant seedlings into the garden after all danger of frost has passed and soil has warmed.

Tip: Ensure soil is at least 60°F for successful transplanting.

Starting seeds indoors can allow plants to be ready 1-3 weeks ahead of outdoor sowing.
Avoid starting green bean seeds indoors as they grow best when direct-seeded.

Synthesized from 5 verified sources:

Gutenberg: War Gardens GuideView →

Old Farmer's AlmanacView →

Gutenberg: Manual of GardeningView →

Old Farmer's AlmanacView →