Madness Series

Petunia

Zone 9b Save Garden

Botanical illustration of Madness Series

🌱 70d to harvest Spreading

Madness Series petunia spills in a living cascade of velvety color, with blooms that seem to glow from within—saturated petals ed…

Crop Dates

Milestone	Date
Start Indoors	Dec 1st
Last Frost	Feb 9th
Transplant / Sow Outdoors	Feb 9th
Harvest Begins	Apr 20th
Harvest Ends	Dec 9th

Crop Details

Trait	Value
Days to Maturity	70
Sun Requirements	Full Sun
Growth Habit	Spreading
Support Needed	None
Planting Depth	Surface
Germination Temp (°F)	75
Min Soil Temp (°F)	55
Min Night Temp (°F)	50
Harden Off (days)	7

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Frequently Asked Questions

How do I manage aphids or botrytis on petunia (Petunia × atkinsiana)?

Check flowers and tender new growth weekly for clusters of aphids; hose them off and spray with insecticidal soap, repeating as needed every 3–5 days until they’re gone. For botrytis (gray mold), remove spent flowers and any soft/brown plant parts, then improve airflow and avoid watering the foliage—water at soil level so the plant stays dry. If botrytis keeps recurring in cool, humid weather, switch to a labeled fungicide for gray mold and follow the label timing (especially after rain).

How often should I water petunia during the main growth phase?

During active growth and flowering, water deeply when the top 1 inch of soil feels dry, which is often about 2–3 times per week in summer depending on heat and container size. Petunia (Petunia × atkinsiana) performs best with consistently moist (not soggy) soil—water until excess drains, then let the top inch dry before watering again. In containers, expect more frequent watering than in beds, and never let pots sit in water.

When is petunia ready to harvest (for seed), given it matures in ~70 days?

Petunia is usually ready for seed harvest about 70 days after sowing when the seed pods on spent flowers turn brown and dry but haven’t fully shattered. Collect pods on a dry day, then open them over a tray to release tiny seeds; let seeds air-dry for a few more days before storing. If pods are still green or soft, wait—fully dry pods release the most viable seed.

Madness Series petunia spills in a living cascade of velvety color, with blooms that seem to glow from within—saturated petals edged in darker depth for a striking, high-contrast finish. The flowers carry a plush, slightly ruffled texture that holds its charm through warm weather, making the plant feel lush and full from morning light to evening. Ideal for trailing and spreading displays, it’s a showy choice for hanging baskets, window boxes, and garden drifts where abundant bloom is the goal.

Sowing Tips

Transplant Conditions

Wait until soil reaches 55°F and nights stay above 50°F before moving outdoors. Harden off for 7 days first.

Expert Note

Start petunias early indoors, then transplant after all frost danger; thinly fertilize and keep the soil evenly moist for steady, weather-resilient bloom.