Madness Series

Family: Solanaceae Garden Petunia

Planting Schedule

Provide your location or planting zone to unlock dates and add Madness Series to a garden.

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.

Light: Full SunMaturity: 70 DaysHabit: Spreading

Botanical illustration of Madness Series

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Madness Series Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	Protected Environment Only
Zone 2a	Mar 16th	May 25th	Aug 3rd – Aug 29th
Zone 2b	Mar 6th	May 15th	Jul 24th – Aug 25th
Zone 3a	Mar 6th	May 15th	Jul 24th – Sep 1st
Zone 3b	Mar 10th	May 19th	Jul 28th – Sep 21st
Zone 4a	Mar 6th	May 15th	Jul 24th – Sep 24th
Zone 4b	Mar 4th	May 13th	Jul 22nd – Sep 27th
Zone 5a	Feb 27th	May 8th	Jul 17th – Sep 30th
Zone 5b	Feb 23rd	May 4th	Jul 13th – Oct 5th
Zone 6a	Feb 20th	May 1st	Jul 10th – Oct 10th
Zone 6b	Feb 14th	Apr 25th	Jul 4th – Oct 16th
Zone 7a	Feb 9th	Apr 20th	Jun 29th – Oct 20th
Zone 7b	Jan 30th	Apr 10th	Jun 19th – Oct 28th
Zone 8a	Jan 21st	Apr 1st	Jun 10th – Nov 5th
Zone 8b	Jan 12th	Mar 23rd	Jun 1st – Nov 12th
Zone 9a	Dec 26th	Mar 6th	May 15th – Nov 26th
Zone 9b	Dec 1st	Feb 9th	Apr 20th – Dec 9th
Zone 10a	Continuous Production
Zone 10b	Continuous Production
Zone 11a	Continuous Production
Zone 11b	Continuous Production
Zone 12a	Continuous Production
Zone 12b	Continuous Production
Zone 13a	Continuous Production
Zone 13b	Continuous Production

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

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.