How to Grow Cool Wave White
Cool Wave White
Convolvulus tricolor
flowerCool Wave White is a trailing morning glory variety with pure white flowers and a yellow center, known for its heat and drought tolerance. It cascades beautifully from hanging baskets, containers, and ground plantings, blooming prolifically throughout the growing season. This cultivar is a compact, low-growing form ideal for mixed borders and landscape color.
When should you plant Cool Wave White in your zone?
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Example Cool Wave White timeline · Pittsburgh, PA (Zone 6b)
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Plant Cool Wave White
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Cool Wave White blooms
Around Jun 1≈ 45 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Cool Wave White dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-10 as an annual; performs best in warm-season climates
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Seed Germination
7-14 daysSmall seed begins sprouting with emergence of cotyledons and tiny leaves
Keep soil consistently moist but not waterlogged. Maintain warm temperatures (70-75°F). Provide bright light immediately upon sprouting.
Seedling
2-3 weeksPlant develops first true leaves and begins forming a compact rosette
Thin seedlings to proper spacing. Provide bright, indirect light to prevent legginess. Water gently to avoid damping off.
Vegetative Growth
3-4 weeksPlant develops multiple stems and trailing branches; lush green foliage dominates with no flowers yet
Maintain consistent moisture without overwatering. Apply balanced fertilizer weekly. Pinch back growing tips to encourage bushier growth if desired.
Flowering
6-10 weeks or until frostPure white trumpet-shaped flowers with yellow centers appear abundantly throughout the plant canopy; blooming continues prolifically
Deadhead spent flowers to encourage continuous blooming. Reduce nitrogen fertilizer, switch to bloom-promoting formula (higher phosphorus). Water consistently.
Decline
Varies; ends at first frostPlant growth slows and flowering diminishes as temperatures cool in fall; foliage may yellow
Continue deadheading to extend blooming. Reduce watering as temperatures drop. Plant is frost-tender; protect or prepare for end of season.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity, spray with water, use miticide if severe. Avoid over-fertilizing with nitrogen.
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Yellow sticky traps, neem oil spray, insecticidal soap. Remove heavily infested leaves.
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Strong water spray, insecticidal soap, or neem oil. Encourage beneficial insects like ladybugs.
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Allow soil surface to dry between waterings, use sand mulch, yellow sticky traps, or mosquito dunks in soil.
Uses
Container and Hanging Basket Display
HouseholdCool Wave White's trailing habit and heat tolerance make it ideal for hanging baskets, window boxes, and mixed containers. The pure white flowers provide striking contrast in combination plantings. [source]
Ground Cover and Landscape Edging
HouseholdPlant in groups along borders, rock gardens, or as a low-growing ground cover. The dense foliage and prolific flowers create colorful landscape swaths with minimal maintenance. [source]
Pollinator Attraction
WildlifeThe bright white trumpet flowers with yellow centers attract butterflies, bees, and other pollinators throughout the growing season. Plant in groups to create attractive feeding stations. [source]
Heat and Drought Tolerance
HouseholdCool Wave White thrives in hot, dry conditions, making it valuable for xeriscaping, southwestern gardens, and areas with water restrictions. Requires less frequent watering than many annuals. [source]
Cut Flower Arrangements
CraftFresh white flowers can be gathered for small arrangements and vase displays. Flowers are delicate but provide elegant white color for floral design. [source]
Harvest Tips
Cool Wave White is grown for ornamental flowers, not harvest. Deadhead spent blooms regularly to promote continuous flowering throughout the season. Pinch off flower stems early in the season if you want a bushier plant with more lateral branching.
Fun Facts
- 🌱 Cool Wave White is a cultivated variety of dwarf morning glory (Convolvulus tricolor), which is distinct from the larger climbing morning glories of the Ipomoea genus—both groups are sometimes confused but belong to the same Convolvulaceae family.
- 🌱 The 'Cool Wave' series was specifically bred for compact, spreading growth habit and exceptional heat tolerance, making it far superior to older morning glory varieties for container growing.
- 🌱 Cool Wave White flowers typically remain open during the day (unlike true morning glories) and can stay open into afternoon on cool or cloudy days, providing longer visual enjoyment.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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