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key growing information
How to Grow Petunias From Seed
How to grow petunias from seed: timing by cell size, light for germination, pelleted seed moisture, growing temperatures, deadheading, spacing, soil and uses.
By Hensley’s Seed Co.
Petunia - Key Growing Information
DAYS TO GERMINATION:
Seedlings appear in 6–10 days at 72–77°F (22–25°C).
SOWING:
Transplants are recommended: sow 4–6 weeks before planting out for 128- to 288-cell trays, or 6–8 weeks for bigger cells or pots. Dust a thin layer of vermiculite over the seed to hold it in place without fully covering it, since light helps germination. Keep the surface moist, which also helps dissolve the coating on pelleted seed. After germination, grow at about 60–75°F (16–24°C) on average. Harden off and plant out once frost danger is past. Deadheading isn't necessary but keeps plants healthier and flowering more. Direct sowing isn't recommended.
LIGHT PREFERENCE:
Full sun.
PLANT HEIGHT:
Varies.
PLANT SPACING:
12–24" apart in beds, or 3 plants per 10–12" container.
HARDINESS ZONES:
Grown as an annual.
SOIL REQUIREMENTS:
Average soil with good drainage.
USES:
Beds, containers, window boxes, hanging baskets, landscapes and ground cover.
SCIENTIFIC NAME:
Petunia × hybrida
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