Shock Wave Yellow

Petunia

Zone 13a Save Garden

Botanical illustration of Shock Wave Yellow

🌱 70d to harvest Spreading

Sunlit “Shock Wave Yellow” spills over the edge with a vivid, warm butter-yellow bloom that seems to glow even in softer light. T…

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	Jan 1st
Transplant / Sow Outdoors	Jan 1st
Harvest Begins	Mar 12th
Harvest Ends	—

Crop Details

Trait	Value
Days to Maturity	70
Sun Requirements	Full Sun
Growth Habit	Spreading
Support Needed	None
Planting Depth	Surface
Germination Temp (°F)	70
Min Soil Temp (°F)	60
Min Night Temp (°F)	50
Harden Off (days)	7

Recommended Companions

Dwarf Greek Basil Basil

Genovese Nero Basil

Frequently Asked Questions

What pest problem is most common on Petunia × atkinsiana (Shock Wave Yellow), and how do I treat it?

Petunias are often hit by aphids, which cluster on new growth and can cause sticky leaves and curled tips. Spray plants with insecticidal soap or horticultural oil, focusing on the undersides of leaves, and repeat every 5–7 days until new growth is clear. If you see heavy buildup early in the season, remove the most infested tips to reduce the colony.

How often should I water Petunia × atkinsiana during active growth?

During the main growing period, water when the top 1 inch of soil feels dry, then water thoroughly so the root zone is evenly moist. In full sun, Shock Wave Yellow often needs watering about 1–2 times per week, but containers may require more frequent checks to avoid drying out completely. Avoid keeping soil soggy because petunias in wet conditions are more prone to root and crown issues.

How can I tell when Petunia × atkinsiana (Shock Wave Yellow) is ready to harvest?

For petunias, harvest is typically “cutting back” rather than picking fruit: start harvesting (deadheading/cutting stems) as soon as you see spent blooms at about 70 days from sowing, continuing weekly. Ready blooms to remove are those that look faded and no longer open, and you’ll also get a better flush when you cut back leggy stems to just above a healthy leaf node. Continue until the plant maintains steady flowering and reduced spent blooms after each cutting.

Sunlit “Shock Wave Yellow” spills over the edge with a vivid, warm butter-yellow bloom that seems to glow even in softer light. The flowers form a trailing, spreading cascade of velvety petals with a gentle, ruffled flare—lush enough to feel full and abundant at every glance. Ideal for hanging baskets, window boxes, and edging where its trailing habit can drape and bloom continuously through the season.

Sowing Tips

Transplant Conditions

Wait until soil reaches 60°F and nights stay above 50°F before moving outdoors. Harden off for 7 days first.

Expert Note

For the best uniform color, keep seedlings evenly moist and start feeding lightly once true leaves appear.