Cultivating Petunias from Seed: The Full Guide

Choosing the right petunia variety is crucial. Whether you prefer mounding or trailing varieties, there are hundreds of options to choose from, each with its unique charm.

Choosing Your Petunia Variety

Before planting, gather necessary materials like potting soil, pots, water, seeds, and labels. A growing light system or greenhouse is ideal for seedlings.

Gathering Planting Materials

Plant your seeds 10 to 12 weeks before the last expected spring frost. Press the seeds just below the soil surface and cover with a plastic dome.

Planting the Seeds

Seedlings should emerge within 7 to 10 days of planting. Once germinated, thin out the seedlings, leaving only 1 or 2 in each pot or cell.

Germination and Thinning

Check seedlings daily for watering needs. The soil should always be moist, but not soggy. Adjust your lights as the seedlings grow, keeping them 4 to 6 inches above the seedlings.

Caring for Seedlings

A few weeks before outdoor planting, harden off your petunias by gradually increasing their exposure to outdoor conditions. This helps them acclimate and prevents shock.

Hardening Off

Consider adding fertilizer to the soil for nutrient support, and check your petunias daily to ensure they're thriving.

Planting Outdoors

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