How to Grow Reblooming Hyrangea
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Reblooming Hyrangea
Hydrangea macrophylla (reblooming cultivars)
shrubReblooming hyandreas are ornamental flowering shrubs that produce flowers on both old and new wood, allowing them to bloom multiple times throughout the season rather than just once. These cultivars are prized for their large, showy flower clusters in pink, blue, purple, or white, depending on soil pH and variety. They offer extended garden color from early summer through fall.
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Example Reblooming Hyrangea timeline · Pittsburgh, PA (Zone 6b)
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Plant Reblooming Hyrangea
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 Reblooming Hyrangea
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Zones 5-9; most reliable in zones 6-8 where late frosts are less likely to damage early buds
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Get my Reblooming Hyrangea timeline →Growth Stages
Establishment (Spring year 1)
4-6 weeksYoung plant is leafing out with limited initial growth; roots are developing into surrounding soil
Water consistently to keep soil evenly moist. Avoid heavy pruning first season. Apply 2-3 inches of mulch around base, keeping 6 inches away from stem.
Vegetative Growth (Late Spring-Early Summer)
6-8 weeksPlant develops vigorous leafy stems; flower buds begin forming on branch tips
Continue regular watering. Pinch back stems in early summer if desired to encourage bushier growth and more flower buds. Feed with balanced fertilizer or hydrangea-specific formula.
First Bloom (Mid-Summer)
4-6 weeksLarge flower clusters open in shades determined by soil pH; flowers may be tight lacecap or full mophead form
Deadhead spent flowers just below the cluster to encourage repeat blooming. Maintain consistent watering; drought stress will reduce subsequent blooms. Watch for fungal issues in humid conditions.
Rebloom (Late Summer-Early Fall)
4-8 weeksSecond or third flush of flowers appears on new growth; colors may be slightly different or deeper than initial bloom
Continue deadheading to extend blooming. Reduce nitrogen fertilizer to avoid excessive vegetative growth. Water during dry periods but allow gradual transition to dormancy.
Dormancy (Late Fall-Winter)
12-16 weeksFoliage turns burgundy or purple before dropping; shrub enters rest period with bare or near-bare branches
Cease fertilizing after August. Reduce watering significantly but don't allow soil to completely dry. Prune selectively in late winter/early spring before new growth emerges. Protect from hard freezes in zone 5.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick in early morning; use pheromone traps away from plant; apply neem oil or spinosad if infestation is heavy
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Increase humidity by misting; spray with strong water stream; apply miticide in severe cases
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Prune out heavily infested branches; apply dormant oil spray in late winter; use horticultural oil during growing season
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Spray with insecticidal soap; encourage beneficial insects; use neem oil if populations are high
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Improve air circulation by pruning; avoid overhead watering; apply sulfur dust or fungicide in humid conditions
Uses
Decorative and dried floral arrangements
CulinaryHydrangea flowers are popular in fresh and dried floral arrangements for weddings, events, and home décor. Dried hydrangea flowers retain their color well and add texture to craft projects and wreaths. [source]
Natural pH indicator for soil testing
HouseholdThe flower color of hydrangeas serves as a visual indicator of soil pH, with blue flowers in acidic soils and pink in alkaline soils. Gardeners often use this natural feedback to adjust soil chemistry. [source]
Traditional herbal remedy
MedicinalIn traditional medicine, particularly in Japanese and Chinese herbalism, hydrangea roots and leaves have been used to support urinary and kidney health. Modern scientific research on hydrangea's bioactive compounds is ongoing. [source]
Pollinator and beneficial insect support
WildlifeHydrangea flowers attract butterflies, bees, and other pollinating insects throughout the season, providing valuable nectar sources during peak summer and fall months when other flowering plants may be declining. [source]
Dyed textiles and natural dye projects
CraftHydrangea flowers and foliage can be used to create natural dyes for fabrics, producing soft blues, greens, and purples depending on mordant and soil chemistry used in the dyeing process. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
For cut flowers, harvest in early morning after dew dries but before heat of day. Cut stems at a 45-degree angle just above a leaf node. Remove lower leaves and immediately place in water with floral preservative. Flowers last 7-10 days in a vase. Deadhead spent flowers by cutting just below the flower head to encourage continuous rebloom throughout the season.
Fun Facts
- 🌱 Reblooming hydrangeas were developed through decades of breeding to overcome the traditional limitation that most hydrangeas only bloom on old wood from the previous year; these cultivars can bloom on new growth, making them more reliable and prolific bloomers
- 🌱 The color of hydrangea flowers is one of the most dramatic examples of soil pH affecting plant pigmentation: acidic soils (pH below 6) produce blue flowers, while alkaline soils (pH above 7) produce pink flowers, with purple shades in between
- 🌱 Hydrangeas are native to Asia and the Americas and have been cultivated for centuries; the name comes from Greek words meaning 'water vessel,' referring to the cup-shaped seed capsule
Gardening Terms
New to gardening? Learn about terms used in this guide:
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