How to Grow Vibrant Geraniums from Seed

Growing geraniums from seed is an easy, rewarding way to add beautiful color to your garden. The process does take some time and patience, but starting geraniums from seed allows you to grow a wider variety of colors compared to buying transplants. With proper care and timing, you can grow geraniums from seed and enjoy months of bright blooms.

When to Plant Geranium Seeds

Geranium seeds need 10-12 weeks of growth before they can be transplanted outdoors. To have blooms for the warm season, start seeds indoors in late winter. The ideal sowing time is January through early February. This gives the slow-growing seedlings time to reach maturity.

Gather Needed Supplies

Before planting geranium seeds, gather the necessary supplies

• Seed starting trays or pots – Use small 2-3 inch cells or pots

• Seed starting mix – A sterile, lightweight mix provides ideal drainage.

• Plastic dome or wrap – Covers help maintain humidity for germination.

• Grow lights or bright window – Seedlings need 12-16 hours under lights or sun.

• Warm area – Geraniums sprout best at 70-75°F. A heat mat can help.

• Liquid fertilizer – Use a balanced, water-soluble plant food once sprouted.

Step-By-Step Guide to Planting

Follow these steps for successfully growing geraniums from seed:

Fill Seed Trays

Fill seed trays or starter pots with pre-moistened seed starting mix. Firm it gently and make sure cells have drainage holes.

Sow Seeds

Place 1-2 geranium seeds in each cell, covering with a thin layer of mix. More than one seed improves the chance of germination.

Cover and Provide Warmth

Cover seeded trays with plastic to retain moisture. Place in a warm spot like the top of a fridge at 70-75°F.

Uncover After Sprouting

Check for sprouting daily. Remove domes as soon as first shoots appear to prevent mold.

Give Light and Moderate Temperature

When sprouted, move to a sunny window or under grow lights at 60-70°F during the day.

Transplant After 2 Sets of Leaves

Transplant into 3-4 inch pots once 2 sets of true leaves emerge. Use fresh potting mix.

Begin Fertilizing

Apply a balanced liquid fertilizer at half strength after transplanting. Increase to full strength later.

Acclimate and Plant Outdoors

Harden off plants for 7-10 days before planting into the garden after the last frost date.

Caring for Growing Seedlings

Proper care while seeds develop into mature plants will maximize blooms later on:

• Maintain consistent moisture – Letting starter mix dry out kills sprouts. Mist gently if needed.

• Give bright light immediately after sprouting – 12-16 hours under grow lights or sun.

• Moderate temperatures to 60-70°F after sprouting – Avoid excess heat which causes stretching.

• Allow space between seedlings – Thin overcrowded starters and repot into larger pots.

• Use sterile potting mix when transplanting – Reused soil can harbor diseases.

• Fertilize at half strength after transplanting – Increase to full strength 2 weeks later.

• Harden off before planting outdoors – Gradually expose to sun, wind and temperature changes.

Troubleshooting Germination Issues

Geranium seeds can be tricky to start. If they fail to sprout, try these tips:

• Ensure fresh seeds – Older seeds often lose viability. Purchase new seed packets.

• Stratify seeds – Refrigerating seeds 4-6 weeks improves germination. Keep moist.

• Check planting depth – Seeds should be just barely covered with soil.

• Maintain warm temperature – Optimal sprouting occurs at 70-75°F.

• Avoid overwatering – Excess moisture causes seeds to rot before sprouting.

With proper timing, care, and patience, you can grow vibrant geraniums from seed. The extra effort provides wider variety options and great satisfaction watching your plants grow.