How to Grow Molonglo Grevillea
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Molonglo Grevillea
Grevillea juniperina 'Molonglo'
shrubMolonglo Grevillea is a compact, hardy cultivar of the spider flower family native to Australia, prized for its needle-like foliage and distinctive red and cream bottlebrush-like flower spikes. This evergreen shrub typically grows 1-2 meters tall and wide, making it ideal for small gardens, containers, and xeriscaping. It attracts native birds and pollinators while thriving in warm, dry climates with minimal supplemental care.
When should you plant Molonglo Grevillea in your zone?
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Example Molonglo Grevillea timeline · Pittsburgh, PA (Zone 6b)
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Plant Molonglo Grevillea
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 Molonglo Grevillea
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Molonglo Grevillea dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 9-11; may tolerate zone 8b with protection in mild microclimates
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Establishment
3-4 weeksYoung transplant with needle-like juvenile foliage; compact growth form emerging
Water regularly to establish roots; provide afternoon shade in hot climates first 2-3 months; avoid overwatering. Apply light mulch away from stem base.
Vegetative Growth
4-6 weeksPlant develops spreading, mounding form with increasingly fine, needle-like foliage; no flowers yet
Reduce watering as drought tolerance increases; light feeding with low-nitrogen fertilizer acceptable but not necessary. Prune lightly to encourage bushiness if desired.
Flowering
8-12 weeks (spring to early summer, may repeat in fall with good conditions)Red and cream bottlebrush flower spikes emerge along branch tips; flowers attractive to honeyeaters and other birds
Maintain reduced watering schedule; deadheading spent flowers promotes additional blooms. Avoid fertilizing with high phosphorus; light micronutrient feeding acceptable.
Mature/Established
Ongoing (3+ years)Plant reaches full size (1-2m) with dense foliage and regular flowering cycles; very drought and heat tolerant
Minimal maintenance required; water only during extreme drought. Light pruning after flowering maintains shape. Avoid heavy pruning into old wood.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity; spray with water or insecticidal soap if severe. Rarely a problem in Australian climates.
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Remove by hand or spray with neem oil or insecticidal soap during active growing season
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Spray with horticultural oil during dormancy or insecticidal soap during growing season
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Ensure excellent drainage and avoid overwatering; remove affected plants and improve soil aeration. Prevent with well-draining soil at planting.
Uses
Bird and Pollinator Attraction
WildlifeThe nectar-rich red and cream flowers are highly attractive to honeyeaters, lorikeets, and other native Australian birds, as well as native bees and butterflies. This makes Molonglo Grevillea an excellent choice for bird-friendly gardens and wildlife corridors. [source]
Ornamental Landscaping
HouseholdIts compact size, fine texture, and year-round foliage make it ideal for small gardens, borders, containers, and xeriscaping designs. The distinctive architecture adds visual interest to Mediterranean, drought-tolerant, and contemporary garden styles. [source]
Cut Flowers
CraftThe long-lasting bottlebrush flowers are suitable for cut flower arrangements and floral displays, adding exotic color and texture to bouquets for 2-3 weeks with water. [source]
Drought-Tolerant Landscaping & Climate Adaptation
HouseholdMolonglo Grevillea is highly valued in water-wise landscaping for dry regions and climate change-resilient gardens, requiring minimal irrigation once established. It thrives in hot, dry conditions where many ornamental shrubs struggle. [source]
Harvest Tips
Not a harvest plant; enjoyed ornamentally. Flowers can be cut for arrangements (they last 2-3 weeks in water), harvested when fully open. Deadhead spent flowers throughout blooming season to encourage continuous flowering.
Fun Facts
- 🌱 Grevillea 'Molonglo' is named after Mount Molonglo in the Australian Capital Territory; this cultivar was specifically selected and bred for improved hardiness and compact growth.
- 🌱 Grevilleas have an unusual flower structure called a 'toothbrush flower' that uniquely exposes pollen-bearing anthers, allowing birds to collect nectar and pollen simultaneously while visiting.
- 🌱 Despite its fine, needle-like appearance resembling juniper (hence the species name 'juniperina'), Grevillea is not related to junipers at all; it belongs to the Proteaceae family and is endemic to Australia.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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