How to Start Basil Seeds
The most popular herb to grow from seed - and one of the easiest!
Basil Seeds Need Light!
Unlike most seeds, basil requires light for germination. Press seeds onto the soil surface but don't bury them. A very light dusting of vermiculite is okay.
Step-by-Step Guide
Prepare Containers
Fill cells or small pots with pre-moistened seed starting mix. Basil has small seeds, so a fine mix works best.
Surface Sow Seeds
Sprinkle 2-3 seeds per cell on the surface. Press gently to make contact with soil. Do not cover! Seeds need light.
Provide Warmth & Light
Place under grow lights (14-16 hours) on a heat mat if room is cool. Keep soil at 70-75°F for best germination.
Keep Moist
Mist daily or cover with a humidity dome. Basil seeds form a gelatinous coating when wet - this is normal! Don't let them dry out.
Thin Seedlings
When seedlings have 2 true leaves (the second set), thin to one plant per cell. Snip extras with scissors - don't pull.
Pot Up
Transplant to 3-4" pots when roots fill the cell. Basil grows fast and may need potting up before outdoor planting time.
Pinch for Bushiness
When plants have 3 sets of true leaves, pinch off the growing tip. This encourages branching for a bushier, more productive plant.
Popular Basil Varieties to Grow
Sweet/Genovese Basil
Classic Italian basil. Large leaves, classic flavor. Best for pesto.
Thai Basil
Anise-like flavor. More heat tolerant. Essential for Asian cooking.
Purple Basil
Stunning color, milder flavor. Beautiful in salads and as garnish.
Lemon Basil
Citrusy flavor. Perfect for fish, tea, and desserts.
Frequently Asked Questions
Do basil seeds need light to germinate?
Yes! Basil seeds require light for germination. Press seeds onto the soil surface and don't cover them, or cover with only a thin dusting of vermiculite.
How long do basil seeds take to germinate?
Basil seeds germinate in 5-10 days at optimal temperature (70-75°F). Cooler temperatures slow germination significantly. Below 60°F, seeds may not sprout at all.
Why are my basil seedlings dying?
Common causes: damping off (fungal disease from overwatering), cold temperatures, or insufficient light causing weak stems. Ensure good drainage, warmth, and bright light.
When should I start basil seeds indoors?
Start basil 4-6 weeks before your last frost date. Basil is very frost-sensitive, so don't rush transplanting. Wait until nighttime temps stay above 50°F.