Wave Purple Classic

Petunia

Zone 12a Save Garden

Botanical illustration of Wave Purple Classic

🌱 70d to harvest Spreading

Velvety, wave-like blooms unfurl in a rich purple that reads almost ink-dark at the center, then blooms outward into a soft, velo…

Crop Dates

Milestone	Date
Start Indoors	Oct 23rd
Last Frost	Jan 1st
Transplant / Sow Outdoors	Jan 1st
Harvest Begins	Mar 12th
Harvest Ends	Dec 31st

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)	50
Min Night Temp (°F)	50
Harden Off (days)	7

Recommended Companions

Red Gem Marigold

African Marigold Marigold

Frequently Asked Questions

What pest or disease is most likely on Petunia × atkinsiana (Wave Purple) in summer, and how do I treat it?

Watch for botrytis/gray mold and leaf spotting during humid, crowded weather—symptoms include gray fuzzy growth or brown patches that spread. Improve airflow (thin spacing, avoid wetting the foliage), remove affected stems, and water at the soil line in the morning. If the problem persists, use a labeled fungicide for ornamentals and repeat according to the label’s schedule.

How often should I water Petunia × atkinsiana during the main growing phase?

In full sun, keep the root zone evenly moist but not soggy: water when the top 1 inch of soil feels dry. A good rule for containers is to water thoroughly until excess drains, then let the top inch dry slightly before the next watering. During heat spikes, check daily because Wave Purple petunias can dry out faster and wilt quickly.

How can I tell when Wave Purple petunias (Petunia × atkinsiana) are ready to harvest or finish for the season?

Petunias aren’t harvested like vegetables; they’re “ready” when they produce abundant blooms at about 70 days from sowing/starting and continue flowering in full sun. To assess readiness, look for steady, open flowers with minimal bud drop, and for new growth at the tips. If flowering slows and plants look tired despite deadheading and consistent watering, that’s your cue to replace or refresh the planting rather than wait for a harvest date.

Velvety, wave-like blooms unfurl in a rich purple that reads almost ink-dark at the center, then blooms outward into a soft, velour glow. Wave Purple Classic forms a trailing, spreading cascade with a dense blanket of flowers and a pleasantly sturdy, weather-tolerant texture that keeps its color looking fresh from bud to peak. Ideal for hanging baskets, window boxes, and garden edges where its long, flowing habit can spill and drape with nonstop ornamental presence.

Sowing Tips

Transplant Conditions

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

Expert Note

Start seeds early, keep seedlings evenly moist (not soggy), and transplant after frost for the fastest, most vigorous purple drifts.