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How to Grow Poorinda Constance Grevillea

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Poorinda Constance Grevillea

Grevillea 'Poorinda Constance'

shrub

Poorinda Constance is a compact, evergreen Australian shrub known for its delicate, needle-like foliage and distinctive red and cream spider-like flowers that attract birds and pollinators. This cultivar is a hybrid grevillea bred for ornamental garden use, combining attractive foliage with prolific flowering. It offers year-round interest with minimal maintenance requirements.

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Example Poorinda Constance Grevillea timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Poorinda Constance Grevillea

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Poorinda Constance Grevillea

    Late summer into fall

    Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Poorinda Constance Grevillea dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun, 6-8 hours daily minimum; prefers bright, unshaded location
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Water: Low to moderate water needs once established; drought tolerant. Water regularly during first growing season and in dry spells, but avoid waterlogging. Reduce watering in winter. Prefers dry conditions to wet soil.
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Spacing: 36 inches
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Days to maturity:
🌱
Planting depth: Same depth as root ball; plant at ground level

Soil

Type: Well-draining sandy or gravelly soil
pH: 5.5-6.5
Amendments:
Coarse sand Perlite Bark chips Avoid heavy clay and high phosphorus fertilizers

Growing Zones

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Thrives in zones 9b-11, with some success in zone 9a with winter protection

9b 10a 10b 11a 11b

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Growth Stages

1

Establishment

3-4 months

Young transplant establishing root system with minimal foliage growth

Water regularly (2-3 times weekly), protect from extreme heat and wind, avoid heavy fertilization. Apply mulch 2-3 inches away from stem base.

2

Vegetative Growth

6-12 months

Plant develops bushy habit with fine, needle-like green foliage; no flowers yet

Reduce watering frequency as roots establish. Prune lightly to shape and encourage branching. Monitor for pests. Light feeding with native plant fertilizer acceptable.

3

Flowering

6-12 weeks, with potential repeat flowering

Distinctive red and cream curved spider-like flowers (6-12 weeks duration) appear at branch tips, attracting honeyeaters and other birds

Maintain consistent watering during bloom. Avoid heavy pruning during flowering. Deadheading spent flowers encourages extended blooming.

4

Mature Shrub

Years 2-10+

Fully formed, compact mounding shrub (3-5 feet tall and wide) with established root system, continuous seasonal flowering, and minimal care requirements

Minimal watering except in drought. Light pruning after flowering to maintain shape. Very drought and heat tolerant once established. No fertilizer needed unless soil severely deficient.

Companion Planting

Plan your garden →

Plant with:

Banksia Leptospermum (Tea Tree) Westringia Xanthorrhoea (Grass Tree) Eremophila Callistemon (Bottlebrush) Hakea Lavender

Avoid planting near:

High-phosphorus plants requiring regular fertilization Plants preferring consistently moist soil Acid-loving plants requiring pH below 5.0 Plants requiring afternoon shade in hot climates

Common Pests

  • Spray with water to dislodge, use miticide if severe; ensure adequate humidity

  • Prune affected branches, apply horticultural oil or neem oil in dormant season

  • Remove affected foliage, apply insecticidal soap if necessary

  • Spray with water, use yellow sticky traps, apply neem oil if needed

Uses

🦋

Pollinator and Bird Attraction

Wildlife

The curved, spider-like red and cream flowers are specifically adapted to attract honeyeaters, lorikeets, and other nectarivorous birds, plus native bees and other pollinators. Excellent for supporting local wildlife and creating a bird-friendly garden. [source]

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Low-Maintenance Landscape Ornamental

Household

Perfect for xeriscaping, drought-tolerant garden design, and low-water landscapes. Requires minimal pruning, fertilizing, or supplemental watering once established, making it ideal for busy gardeners or water-conscious regions. [source]

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Garden Display and Aesthetic Appeal

Craft

Compact mounding habit and year-round fine foliage create attractive garden structure. Red and cream flowers provide striking seasonal color contrast. Excellent for borders, hedging, foundation planting, or specimen displays. [source]

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Habitat Creation

Household

Dense foliage provides shelter and nesting sites for native birds and beneficial insects. Contributes to biodiversity in urban and suburban gardens, supporting local ecosystems. [source]

Harvest Tips

Not harvested for food or cutting; grown purely as ornamental. Flowers may be enjoyed in situ for bird-watching; allow flowers to remain for maximum bird attraction and pollinator benefit.

Fun Facts

  • 🌱 Grevillea 'Poorinda Constance' is part of the Poorinda series of hybrid grevilleas, developed in Australia specifically for ornamental garden cultivation and improved hardiness
  • 🌱 The name 'Grevillea' honors Charles Francis Greville, founder of the Royal Horticultural Society; the genus comprises over 360 species native to Australia and nearby regions
  • 🌱 Grevilleas have a specialized relationship with native Australian honeyeaters—the curved flower shape perfectly matches the bird's beak, an example of co-evolution

Gardening Terms

New to gardening? Learn about terms used in this guide:

Cultivar Deadhead Full Sun Hybrid Mulch Native Plant Transplant
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