Wave Purple

Petunia

Zone 10a Save Garden

🌱 70d to harvest Spreading

Velvety, wave-like blooms in luminous violet—each petal edged with a soft, darker halo—spill in a cascading curtain that feels al…

Crop Dates

Milestone	Date
Start Indoors	Nov 7th
Last Frost	Jan 16th
Transplant / Sow Outdoors	Mar 13th
Harvest Begins	May 22nd
Harvest Ends	Dec 19th

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

Recommended Companions

Durango Red Marigold

Taishan Yellow Marigold

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.

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.

Sowing Tips

Transplant Conditions

Wait until soil reaches 60°F and nights stay above 45°F before moving outdoors. Harden off for 7 days first.

Expert Note

Start petunia early indoors and keep seedlings evenly moist with bright light—cool nights and low light cause leggy growth.