Wave Purple

Family: Solanaceae Garden Petunia

Planting Schedule

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Velvety, wave-like blooms in luminous violet—each petal edged with a soft, darker halo—spill in a cascading curtain that feels almost luminous at dusk.

Wave Purple’s trailing habit forms a dense, spreading mound of color with a satin-smooth flower texture and a steady, garden-filling display through the season. Ideal for bedding and hanging baskets where you want a continuous ribbon of purple bloom for borders, walkways, and patio planters.

Light: Full SunMaturity: 70 DaysHabit: Spreading

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Wave Purple 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	Jul 20th	Sep 28th – Aug 29th
Zone 2b	Mar 6th	Jul 10th	Sep 18th – Aug 25th
Zone 3a	Mar 6th	Jul 10th	Sep 18th – Sep 1st
Zone 3b	Mar 10th	Jul 14th	Sep 22nd – Sep 21st
Zone 4a	Mar 6th	Jul 10th	Sep 18th – Sep 24th
Zone 4b	Mar 4th	Jul 8th	Sep 16th – Sep 27th
Zone 5a	Feb 27th	Jul 3rd	Sep 11th – Sep 30th
Zone 5b	Feb 23rd	Jun 29th	Sep 7th – Oct 5th
Zone 6a	Feb 20th	Jun 26th	Sep 4th – Oct 10th
Zone 6b	Feb 14th	Jun 20th	Aug 29th – Oct 16th
Zone 7a	Feb 9th	Jun 15th	Aug 24th – Oct 20th
Zone 7b	Jan 30th	Jun 5th	Aug 14th – Oct 28th
Zone 8a	Jan 21st	May 27th	Aug 5th – Nov 5th
Zone 8b	Jan 12th	May 18th	Jul 27th – Nov 12th
Zone 9a	Dec 26th	May 1st	Jul 10th – Nov 26th
Zone 9b	Dec 1st	Apr 6th	Jun 15th – 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	Normal
Germination Temp (°F)	75
Min Soil Temp (°F)	60
Min Night Temp (°F)	45
Harden Off (days)	7

Frequently Asked Questions

Why are my Wave Purple petunias getting gray, fuzzy spots or collapsing stems—how do I fix it?

This is often Botrytis (gray mold) or related fungal stem/flower blight that shows up in cool, damp conditions and on crowded plants. Remove and discard any affected flowers/stems, then thin for airflow and water at the soil level (not overhead). Treat with a labeled fungicide for botrytis/leaf spots on petunias and avoid wetting foliage again for several days.

How often should I water Wave Purple petunias during active growth?

During the main growth period, keep the root ball evenly moist but never waterlogged; water when the top 1 inch of soil feels dry. In full sun heat, this can mean daily checks and watering most days, especially in containers. If buds and leaves droop from dryness, water thoroughly until excess drains, then let the top layer dry slightly before the next watering.

How do I know when Wave Purple petunias are ready to harvest (and what counts as “ready”)?

Petunias (Petunia × atkinsiana) are grown for flowers rather than harvested fruit or leaves, so “ready” means the plant has formed quality blooms about 70 days from sowing. Start harvesting/cutting individual stems when flowers are fully colored and open, and remove spent blooms promptly to encourage continuous flowering. If you’re saving seed, harvest when seed pods turn tan and dry and the seeds easily release from the pods.