How to Grow Pacifica
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Pacifica
Hydrangea macrophylla 'Pacifica'
shrubPacifica is a bigleaf hydrangea cultivar known for its large, vibrant mophead flowers that bloom profusely throughout the summer. This deciduous shrub produces abundant pink or blue flowers depending on soil pH, making it a popular choice for borders and containers. It's valued for its reliable blooming habit and ornamental appeal in temperate gardens.
When should you plant Pacifica in your zone?
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Example Pacifica timeline · Pittsburgh, PA (Zone 6b)
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Plant Pacifica
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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Harvest Pacifica
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Pacifica dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 6-8, hardy to zone 5b with winter protection
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Get my Pacifica timeline →Growth Stages
Establishment
Spring through fall of first yearYoung plant focuses on root development with modest foliage growth and minimal flowering
Keep soil evenly moist, provide afternoon shade, apply 2-3 inches of mulch, avoid heavy pruning
Vegetative Growth
Year 2, spring through early summerPlant develops full canopy of large, dark green leaves; branching increases and plant fills out
Regular watering, monthly balanced fertilizer in growing season, remove dead wood in early spring
Bud Formation
Mid-summer through late summerLarge, rounded flower buds form at branch tips, green initially then showing color as they swell
Maintain consistent moisture and regular feeding with hydrangea-specific fertilizer, avoid pruning after mid-summer
Flowering
Late June through September, 8-12 weeksMassive mophead flower clusters open in pink, blue, or purple tones depending on soil chemistry; flowers large and densely packed
Deadhead spent blooms if desired (cutting below first leaf node encourages more flowers), maintain moisture, continue light feeding
Dormancy
November through MarchFlowers fade and brown, leaves yellow and drop; plant enters winter rest with bare woody stems
Reduce watering significantly, stop fertilizing, avoid pruning until spring, apply winter mulch in colder zones
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick early morning, use row covers, apply neem oil, introduce parasitic wasps, avoid beetle traps near prized plants
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Increase humidity and water misting, spray with strong water stream, use miticide if severe, ensure adequate moisture
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Prune infested stems, apply dormant oil spray in late winter, use insecticidal soap in early summer
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Improve air circulation, avoid overhead watering, apply sulfur or fungicide spray, remove infected leaves
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Spray with water, introduce beneficial insects, use insecticidal soap, apply neem oil
Uses
Fresh and dried cut flowers
HouseholdPacifica hydrangeas produce excellent long-lasting cut flowers for bouquets and arrangements. They can also be easily dried by hanging stems upside-down in a warm, dark location, creating beautiful dried arrangements that last for years. [source]
Landscape focal point
OrnamentalThe prolific, large mophead flowers make Pacifica an outstanding specimen shrub for borders, foundation plantings, and mixed perennial gardens. Its extended summer bloom period provides continuous color and structure to the garden. [source]
Container gardening
HouseholdPacifica's manageable size and abundant flowers make it ideal for large containers on patios and decks, allowing gardeners in small spaces to enjoy hydrangea beauty. Containers offer flexibility to control soil pH for desired flower color. [source]
Pollinator support
WildlifeThe abundant flowers attract bees, butterflies, and other beneficial pollinators throughout the summer blooming season. The plant provides an important nectar source during mid to late summer when other flowers may be scarce. [source]
Traditional herbal use
MedicinalHydrangea root has been used in traditional herbal medicine, particularly in Native American and Asian traditional medicine for urinary and kidney support, though clinical evidence is limited. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Cut flowers for arrangements when mopheads are fully open and firm to touch (usually mid-July through August). Cut stems at a 45-degree angle early morning. For dried flowers, harvest blooms in late summer when they show papery texture and dull coloring. Leave some flowers on plant for fall ornament.
Fun Facts
- 🌱 Pacifica's flower color acts as a natural pH indicator: acidic soils (pH below 6.0) produce blue flowers, while neutral to alkaline soils (pH above 7.0) produce pink flowers; intermediate pH values create purple or lavender blooms.
- 🌱 Hydrangea mophead flowers are composed of many tiny florets clustered tightly together, with each flower cluster (called a lacecap when arranged differently) potentially containing hundreds of individual flowers.
- 🌱 Pacifica hydrangeas were originally cultivated in Japan and are among the most popular ornamental shrubs in Europe and North America, prized for their ability to reliably produce massive flower displays year after year.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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