Firefly Petunias arrive in compostable paper pots as either a trio of smaller starter plants (45 mm each) or a larger plant with a ceramic pot (80 mm). Keep the compostable paper lining on the pots when transplanting.

While the plant trios should be placed in soil immediately, the 80 mm plant fits directly into its included ceramic pot and can be moved to a larger container as it grows. Up to three young plants may be planted together in an 8–12 inch container. Plant outdoors only after nighttime temperatures are consistently above 40°F.

Firefly Petunias are suited for spring and summer growing conditions. They grow best when temperatures are cool to warm. Avoid exposing plants to excessive heat or freezing temperatures.

Firefly Petunias are heavy feeders and thrive on regular fertilization.

Use the included sample of Light Bio Petunia Nutrition, specially formulated to provide the essential nutrients for healthy growth and optimal glow. A single packet makes over a gallon of solution and can be stored for months away from sunlight. If using an alternative fertilizer, choose a petunia-specific formulation with chelated iron.

Shop Light Bio Petunia Nutrition With Iron & Essential Micronutrients

Firefly Petunias prefer well-draining soil with a neutral to slightly acidic pH. If you are planting in containers or hanging baskets, use a high-quality potting mix that includes peat moss and perlite or vermiculite for good drainage.

Firefly Petunias thrive in full sun, needing 6 to 12 hours of direct sunlight daily for optimal growth. They can tolerate partial shade, but the bioluminescence may be reduced.

Maintain consistently moist soil without overwatering. To prevent the plants from drying out, check moisture levels frequently—especially when planted in containers or during hot, dry spells.

Plant Firefly Petunias about 6 to 8 inches apart to allow for adequate air circulation and room for growth.

While petunias bloom continuously, removing spent flowers keeps plants looking tidy and encourages new growth. Trim back leggy or browning growth to promote fresh, bushy growth and renewed blooming.

Monitor for common pests such as aphids, whiteflies, and spider mites. Fungal disease can be a problem in overly wet or humid conditions; ensure good air circulation and avoid overhead watering.