Description
How to grow Petunias
Easy to grow from seeds and a short germination time. You can start Petunias indoors or outdoors. Petunias flower throughout the whole season into late fall. Removing the spent flowers will provide even more flowers, great for hanging baskets, pots, and balcony, but in full ground they are amazing as well.
To grow petunias from seed indoors, start about 10-12 weeks before the last expected frost. Sow seeds on the surface of a moist seed-starting mix, press them gently into the soil, and avoid burying them. Keep the container warm and moist, ideally with a humidity dome, and provide bright light.
You can sow directly outside once soil temperatures reach 70°F. Seeds should be spread on the surface of the soil or growing medium and pressed in firmly for good soil contact. Petunia seeds need light to germinate, so don’t bury the seeds in the soil. To prevent dislodging the seeds, water by misting.
Early spring start indoors:
Start petunia seeds indoors 10-12 weeks before the last expected frost in your area. Use a good quality seed-starting mix, which is lighter and more porous than regular potting soil. Use small, shallow containers like seed trays or individual seed pots.
Planting the seeds:
Sprinkle the petunia seeds thinly on the surface of the moist seed-starting mix. Gently press the seeds into the soil with a pencil or a small object. Petunia seeds need light to germinate, so don’t cover them with soil.
The germination environment:
Keep the container warm, ideally around 70-75°F (21-24°C). A heat mat can be helpful. Keep the soil consistently moist but not soggy. Mist the surface with water to avoid disturbing the seeds. A humidity dome or clear plastic wrap can help maintain moisture and warmth. Provide bright, indirect light. A window with a north or east-facing exposure is ideal, or use grow lights.
After Germination:
Once seedlings emerge, remove the humidity dome. Continue to provide bright light. You may need to use grow lights to supplement natural light. Continue to water as needed, keeping the soil moist but not soggy. Once seedlings have several sets of leaves, you can begin fertilizing with a diluted liquid fertilizer.
Hardening Off and Transplanting:
Before transplanting outdoors, harden off the seedlings by gradually acclimating them to cooler temperatures and more sunlight over a week or two. Once the weather is consistently warm (above 60°F or 15°C) and the threat of frost has passed, you can transplant the seedlings into their final planting locations.
* 20 seeds per package
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