Introduction to Dogwood vs Crepe Myrtle
When choosing trees for Australian gardens, the debate of dogwood vs crepe myrtle often arises. Both are stunning deciduous trees prized for their flowers, but they suit different climates and conditions down under. Dogwoods (Cornus species, like Cornus florida or Cornus kousa) offer delicate spring blooms and vibrant autumn foliage, while crepe myrtles (Lagerstroemia indica) dazzle with long-lasting summer flowers and striking bark.
In Australia, where climates range from subtropical Queensland heat to cool Tasmanian winters, selecting the right one matters. Crepe myrtles dominate warmer regions like Sydney’s coastal suburbs or Brisbane backyards, thriving in full sun and heat. Dogwoods prefer the milder, higher rainfall areas of Victoria, Tasmania or southern New South Wales highlands. This guide breaks down the key differences to help you decide.
Appearance and Flowering
Dogwood Flowers and Foliage
Dogwoods produce showy bracts—modified leaves that mimic petals—in spring. Cornus florida displays white or pink crosses up to 10 cm across from September to November in Australia. Cornus kousa follows with star-shaped white flowers and strawberry-like edible fruits in summer. Leaves turn fiery red, orange or purple in autumn, adding year-round appeal.
The tree’s layered branching creates a horizontal, spreading canopy, ideal for underplanting.
Crepe Myrtle Flowers and Foliage
Crepe myrtles explode with crinkled, crepe-paper-like blooms from December to March. Flower colours range from white and pink to red, purple and lavender, in clusters up to 30 cm long. New leaves emerge bronze or red, maturing to green, with orange-red autumn tones. The real showstopper? Smooth, peeling bark in mottled greys, tans and mahoganies on mature trunks.
Crepe myrtles grow upright with vase-shaped canopies, perfect for narrow spaces.
Winner for flowers? Crepe myrtle for longer bloom time and bolder colours in hot Aussie summers; dogwood for delicate spring elegance.
Size and Growth Habits
Dogwoods are compact: mature heights of 4-8 metres and spreads of 4-6 metres, making them suited to small suburban gardens or as feature trees. They grow slowly, about 30-60 cm per year, forming a low-branching, multi-stemmed habit.
Crepe myrtles vary by cultivar: dwarfs like ‘Pocomoke’ reach 1.5-3 metres, while giants like ‘Natchez’ hit 8-10 metres tall and 6-8 metres wide. Growth is moderate to fast (60-90 cm/year), with a single or multi-trunk form that responds well to pruning.
In Australian conditions, crepe myrtles fill out quickly in fertile soils, while dogwoods need protection from harsh winds.
Climate Suitability for Australia
Australia’s diverse zones make climate the biggest decider in dogwood vs crepe myrtle.
Dogwood Climate Needs
Dogwoods hail from cooler northern hemisphere forests, thriving in USDA zones 5-9 (Aussie equivalents: cool temperate like Melbourne’s zone 9-10 or Tasmania’s highlands). They handle frosts to -15°C but struggle in humidity and heat above 30°C consistently. Best in southern states: Victoria, Tasmania, cool NSW tablelands or Adelaide hills. Avoid tropical north—high humidity invites diseases.
They prefer 800-1200 mm annual rainfall or regular watering.
Crepe Myrtle Climate Needs
Native to subtropical Asia, crepe myrtles love USDA zones 7-10 (perfect for coastal Queensland, NSW, northern VIC and WA’s southwest). They endure 40°C+ summers, mild frosts to -10°C, and drought once established. Stars in Perth’s dry heat or Gold Coast humidity.
Minimum 600 mm rainfall, but they cope with less in sandy soils.
Aussie verdict: Crepe myrtle for 80% of gardens (warmer east/west coasts); dogwood for cooler south.
Soil, Water and Planting Requirements
Soil Preferences
- Dogwood: Acidic, well-drained loams (pH 5.5-6.5). Mulch with pine bark to mimic forest floors. Avoid heavy clays.
- Crepe Myrtle: Neutral to slightly alkaline, fertile, well-drained soils (pH 5.5-7.5). Tolerates clays and sands; add gypsum if sodic.
Watering and Planting
Plant both in autumn or early spring. Dogwoods need consistent moisture—deep water weekly in first two years, then 25-50 mm/month. Crepe myrtles are drought-tough: water deeply fortnightly initially, then rarely.
Site dogwoods in partial shade (4-6 hours sun) to prevent leaf scorch; crepe myrtles demand full sun (6+ hours).
Pruning, Maintenance and Pests
Pruning
- Dogwood: Minimal—remove deadwood post-flower. Shape in winter if needed; avoid heavy cuts.
- Crepe Myrtle: Famous for ‘crepe murder’—avoid topping. Prune in winter: thin to vase shape, remove suckers, cut to outward buds. This boosts blooms and bark.
Pests and Diseases
- Dogwood: Susceptible to anthracnose (wet springs), powdery mildew, borers. Use copper fungicide preventatively in humid areas.
- Crepe Myrtle: Aphids, whitefly, sooty mould—hose off or use eco-oil. Resistant to most diseases in dry Aussie conditions.
Both attract birds: dogwood berries feed natives; crepe myrtle flowers draw bees.
Garden Uses and Varieties for Australia
Dogwood Uses
Shade tree, screen, aviary feature. Varieties: ‘Rainbow’ (variegated leaves), ‘Eddie’s White Wonder’ (huge bracts).
Crepe Myrtle Uses
Street tree, patio feature, espalier. Top Aussie picks: ‘Sioux’ (pink, 5m), ‘Gamad I’ (Dynamite, red, 4m), ‘Natchez’ (white, 8m).
Mix them: dogwood under taller crepe myrtle in transitional climates like Canberra.
Dogwood vs Crepe Myrtle: Head-to-Head Summary
| Feature | Dogwood | Crepe Myrtle |
|---|---|---|
| Best Climate | Cool temperate south | Subtropical/temperate |
| Flower Season | Spring (Sep-Nov) | Summer (Dec-Mar) |
| Height | 4-8m | 3-10m (varied) |
| Sun Needs | Part shade | Full sun |
| Drought | Low tolerance | High |
| Maintenance | Low | Moderate (prune well) |
Final Recommendation for Australian Gardeners
Choose crepe myrtle if you garden in warmer zones (most of Australia)—its heat tolerance, long flowers and low water needs make it a winner. Opt for dogwood in cooler, shadier spots for spring drama and autumn colour.
Test soil and microclimate first. Source grafted natives-adapted stock from local nurseries like Plantmark or Ausflora. With right placement, either elevates your garden—happy planting!