Starting Marigold Seeds Indoors: Early Season Propagation

Overview

Marigolds add vibrant color to beds and containers. For the longest blooming season, start seeds indoors 6 weeks before your last frost date (per Purdue University Horticulture). Simple indoor preparation yields robust transplants for impressive outdoor displays.

Step-by-Step Indoor Seed Starting

Step 1: Prepare Moistened Growing Medium

Place seed-starting mix in a large bucket and moisten thoroughly.

Step 2: Fill Peat Pots

Fill peat pots to ¾ inch from the top with moistened mix.

Step 3: Create Seed Indentations

Make a small dent in the center of each pot's soil surface with your forefinger.

Step 4: Sow Seeds

Drop one seed per indentation and cover with ¼ inch of mix.

Step 5: Create Mini Greenhouse

Place pots on a tray and cover with clear plastic wrap to retain heat and moisture.

Step 6: Provide Bottom Heat

Set tray on refrigerator top, water heater, or heating pad (low) to maintain 60°F+ soil temperature for germination.

Step 7: Remove Cover at Germination

Remove plastic when seeds sprout (3-4 days). Move to bright window with direct sunlight.

Step 8: Bottom Watering

Keep peat pots moist by adding water to the tray bottom.

Step 9: Harden Off Before Transplant

Set tray outdoors 3-4 days before garden planting to acclimate seedlings to outdoor conditions.