Tidal Wave Silver

Petunia

Zone 8b Save Garden

Botanical illustration of Tidal Wave Silver

🌱 70d to harvest Spreading

A silver-edged spectacle that catches the light like moonlit lace—Tidal Wave Silver spills in a trailing cascade of soft, luminou…

Crop Dates

Milestone	Date
Start Indoors	Jan 12th
Last Frost	Mar 23rd
Transplant / Sow Outdoors	May 4th
Harvest Begins	Jul 13th
Harvest Ends	Nov 12th

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

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Frequently Asked Questions

What pest or disease issue commonly affects Petunia × atkinsiana (Tidal Wave Silver), and how can I treat it?

Watch for powdery mildew and botrytis gray mold, especially when plants stay wet overnight or airflow is poor. Remove affected leaves, water at the soil line (not the foliage), and space plants so they aren’t touching; for mildew, use a labeled fungicide and repeat as directed. If you see persistent aphids or whiteflies, spray with insecticidal soap and reapply every 5–7 days until numbers drop.

How often should I water Tidal Wave Silver petunias during peak summer growth, and what soil moisture level do they need?

During active growth, keep the root zone evenly moist but never soggy—aim for watering whenever the top 1 inch of soil feels dry. In full sun, this often means watering about 1–2 times per week in ground beds, or daily checks in containers, because pots dry faster. If leaves droop and flowers fade quickly, water thoroughly until excess drains, then let the top layer dry slightly before the next watering.

How do I know when Tidal Wave Silver petunias are ready to harvest or are at peak bloom?

Petunia × atkinsiana isn’t harvested for fruit; readiness is measured by flowering performance. At about 70 days from sowing (typical maturity), expect consistent blooms with strong, cascading growth in full sun. For peak “harvest” of flowers, pinch or snip spent blooms when they start to look dull or drop petals—new buds should follow within about a week if light and moisture are right.

A silver-edged spectacle that catches the light like moonlit lace—Tidal Wave Silver spills in a trailing cascade of soft, luminous blooms with cool-toned, subtly veined petals. Expect a velvety, petal-rich texture and a dense, spreading habit that blankets containers and beds with long-lasting color from early summer through fall. Grow it for show-stopping mass color in hanging baskets, window boxes, and tumbling borders where its trailing presence becomes the centerpiece.

Sowing Tips

Transplant Conditions

Wait until soil reaches 55°F and nights stay above 50°F before moving outdoors. Harden off for 7 days first.

Expert Note

Start petunia indoors early (they’re slow to establish), keep seedlings bright to prevent legginess, then transplant after night temperatures are reliably warm.