How to Grow Red Spire Mirror Plant
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Red Spire Mirror Plant
Coprosma robusta 'Red Spire'
shrubRed Spire is a striking cultivar of mirror plant known for its narrow, upright growth habit and vibrant red-tinged foliage that deepens in color with cooler temperatures and bright light. This evergreen shrub produces small, inconspicuous flowers followed by decorative coral-red berries in autumn and winter. It's valued as an ornamental specimen for hedging, screening, and adding vertical interest to gardens.
When should you plant Red Spire Mirror Plant in your zone?
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Example Red Spire Mirror Plant timeline · Pittsburgh, PA (Zone 6b)
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Plant Red Spire Mirror Plant
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 Red Spire Mirror Plant
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 9-11; tender to frost
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Establishment
3-6 monthsYoung plant with compact, columnar form and emerging reddish-green foliage
Water regularly to establish deep roots. Mulch around base. Avoid transplanting once established.
Vegetative Growth
Spring-summer, ongoingPlant develops dense, narrow upright branching; foliage deepens in red coloration with cool weather and bright light
Apply balanced fertilizer monthly during growing season (spring-summer). Prune lightly to maintain shape and height control. Remove any crossing or weak branches.
Flowering
Spring (2-4 weeks)Small white-cream flowers appear along stems; flowers are inconspicuous but precede berry production
Minimal intervention needed. Flowers indicate successful pollination if both male and female plants present (usually dioecious). Maintain consistent watering.
Fruiting
Autumn-winter (3-4 months)Decorative coral-red to scarlet berries develop along branches, lasting through autumn and winter
Provide female plants with nearby male pollinator if berry production desired. Reduce nitrogen fertilizer to avoid excessive vegetative growth that reduces berry display.
Winter Rest
Winter (3-4 months)Growth slows; foliage reaches deepest red coloration in cool climates; berries persist and brighten landscape
Reduce watering slightly but maintain moisture. In frost-prone areas (zone 9), provide wind protection and consider burlap wrapping for young plants. No fertilizer needed.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with horticultural oil in early spring; prune heavily infested branches; encourage beneficial insects like ladybugs
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Isolate infested plants; spray with insecticidal soap or neem oil; use systemic insecticide if severe
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Increase humidity; spray foliage with water; apply miticide if infestation severe; avoid excess nitrogen fertilizer
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Yellow sticky traps; spray with insecticidal soap or neem oil; reflective mulches can deter
Uses
Ornamental Hedging & Screening
HouseholdRed Spire's narrow, columnar form makes it ideal for living fences, privacy screens, and windbreaks. Plant 2-3 feet apart in a line for a striking red-foliaged barrier. [source]
Specimen & Focal Point
HouseholdThe vibrant red foliage and upright habit provide year-round visual interest and striking color contrast in modern gardens, Mediterranean landscapes, and contemporary design schemes. [source]
Cut Foliage & Arrangements
CraftReddish branches with coral berries are prized in autumn and winter floral arrangements, providing natural texture, color, and extended vase life. [source]
Bird & Pollinator Support
WildlifeSmall flowers attract native bees and pollinators in spring; red berries provide valuable winter food source for native birds and wildlife, supporting local ecosystems. [source]
Coastal & Wind-Tolerant Screening
HouseholdCoprosma robusta is salt-tolerant and wind-hardy, making Red Spire excellent for coastal gardens, exposed sites, and challenging growing conditions where other ornamentals struggle. [source]
Harvest Tips
Not typically harvested. Berries can be cut for ornamental arrangements in autumn and winter; cut branches with berries intact, removing lower leaves for floral design.
Fun Facts
- 🌱 The common name 'Mirror Plant' derives from the glossy, reflective nature of the foliage on the species; 'Red Spire' intensifies this ornamental quality with brilliant red coloration.
- 🌱 Coprosma robusta is native to New Zealand where it's called 'karamu,' and has been valued by Māori people for traditional medicine and food sources.
- 🌱 The bright red berries persist on branches well into winter, providing a striking contrast against evergreen foliage and attracting native birds during lean seasonal food periods.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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