Wave (spreading) petunias are show-stoppers with masses of 2-inch blooms, drought/pest resistance, and rapid growth. Start seeds indoors ~3 months before last frost.
Fill seedling tray with commercial potting mix. Scatter seeds lightly on surface—do not cover.
Use fine mist spray bottle. Seeds are tiny; covering them inhibits germination.
Cover tray with clear plastic. Place in bright indirect light—no direct sun or hot windowsills. Ideally, hang fluorescent bulb 4–6 inches above for 15–18 hours/day.
Maintain 70–85°F for germination.
When 3 true leaves appear (after initial seed leaves), move to cell packs or peat pots. Feed every 2 weeks with half-strength liquid fertilizer.
After frost danger passes, set outside days, inside nights for a few days.
Full sun, but protect from hot afternoon sun for 2 weeks. Keep soil moist.
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