Introducing Bunnings Diamonds in the Dark Crepe Myrtle
If you’re hunting for a compact, eye-catching plant that thrives in Australian conditions, the Bunnings Diamonds in the Dark crepe myrtle (Lagerstroemia indica ‘Diamonds in the Dark’) is a gem. This hybrid variety stands out with its glossy, burgundy-black foliage that emerges in spring, transitioning to deep green by summer. Topped with clusters of pure white crinkly flowers from late spring to autumn, it delivers year-round interest. Growing to just 1.5-2 metres tall and wide, it’s ideal for small gardens, patios, or as a feature in cottage-style borders.
Bred for durability, this crepe myrtle shines in our diverse climates – from subtropical Queensland to temperate Victoria. Available at Bunnings nurseries, it’s a budget-friendly option at around $20-30 for a 20cm pot. Its non-invasive roots make it safe near driveways or pools, unlike larger tree forms.
Why Choose Diamonds in the Dark?
- Striking contrast: Dark leaves make white flowers pop, especially under moonlight – hence the ‘Diamonds in the Dark’ name.
- Compact size: Perfect for urban backyards or pots (use 40-50cm diameter).
- Multi-season appeal: Spring flush of new growth, summer blooms, autumn orange-red foliage, and attractive winter bark.
- Drought-tolerant once established: Suits water-wise gardening.
In Australian trials, it outperforms older varieties in heat and humidity resistance, making it a top pick for coastal or inland gardens.
Planting Your Bunnings Diamonds in the Dark Crepe Myrtle
Best Time to Plant
Plant in autumn or early spring to allow root establishment before summer heat. Avoid mid-winter in frosty areas (USDA zones 8-11, covering most of Australia).
Site Selection
- Full sun: At least 6 hours daily for maximum blooms. South-facing spots in tropics may reduce flowering.
- Soil: Well-drained, fertile loam. pH 5.5-7.5. Amend heavy clay with 30% compost or gypsum (1-2kg per square metre).
- Spacing: 1.5m apart for hedges; solo plants need 2m clearance.
Step-by-Step Planting Guide
- Dig a hole twice the pot width, 30cm deep.
- Mix in 5-10cm compost and slow-release fertiliser (e.g., native plant formula, 50g per hole).
- Water the pot well, remove gently, tease out circling roots.
- Position so the top of the root ball is level with soil surface.
- Backfill, firm soil, and mulch with 5-7cm sugar cane or lucerne to 10cm from trunk.
- Water deeply (20-30L) immediately, then weekly for the first 3 months.
For pots: Elevate on pot feet for drainage. Use premium potting mix with added perlite.
Ongoing Care for Thriving Plants
Watering
New plants need 25-40L weekly in the first summer. Once established (after 12 months), it’s drought-hardy – water during prolonged dry spells (over 3 weeks). Deep, infrequent watering encourages strong roots. In sandy soils, mulch retains moisture better.
Fertilising
- Spring: Balanced NPK 10-10-10 granular (100g per mature plant), followed by liquid seaweed fortnightly.
- Summer: High-potassium booster (e.g., PowerFeed) every 4 weeks for blooms.
- Avoid: High-nitrogen feeds post-spring to prevent soft growth prone to aphids.
In alkaline soils (common in WA), add iron chelate annually to prevent chlorosis.
Pruning Essentials
Crepe myrtles flower on new wood, so prune hard for shape and blooms.
- Winter prune (July-August): Remove crossing branches, suckers at base. Tip-prune to 30-50cm above ground for compact bushes; leave longer for standards.
- Summer tidy: Deadhead spent flowers to extend blooming.
- Tools: Sharp secateurs, loppers. Disinfect between cuts.
Expect a ‘knobby’ look post-prune – new growth explodes in spring!
Pest and Disease Management
Generally tough, but watch for:
- Aphids/scale: Spray with eco-oil or neem weekly. Introduce ladybirds.
- Powdery mildew: Common in humid areas (QLD/NSW coast). Improve air flow; use sulphur-based fungicide if severe.
- Root rot: From wet feet – ensure drainage.
In Aussie heatwaves, mist foliage evenings to deter spider mites.
Australian Climate Adaptability
Diamonds in the Dark handles our extremes:
- Subtropical (Brisbane, Sydney): Loves the warmth; protect from northerlies with windbreaks.
- Temperate (Melbourne, Adelaide): Mulch heavily for frost (down to -5°C). Flowers reliably.
- Arid (Perth, inland NSW): Thrives post-establishment; supplement winter water.
- Tropical (Darwin, Cairns): Best in elevated, breezy spots; may need copper fungicide for mildew.
CSIRO trials show it uses 30% less water than traditional Lagerstroemia once mature.
Design Ideas and Companions
- Borders: Pair with lavender (Lavandula) for purple-white contrast, or Lomandra for texture.
- Pots: Group three in a large ceramic planter with Agapanthus.
- Hedges: Plant 1.2m apart for a 1.8m screen.
- Topiary: Train as balls or spirals with staking.
Underplant with Dichondra for a lush carpet, or succulents in dry zones.
Propagation Tips
Home propagation is straightforward:
- Take 10cm semi-hardwood cuttings in late summer.
- Dip in rooting hormone, plant in sandy mix under shade cloth.
- Roots in 4-6 weeks; pot on after 3 months.
Seedlings vary, so stick to cuttings for true colour.
Common Mistakes to Avoid
- Overwatering: Leads to weak stems.
- Skipping mulch: Exposes roots to heat.
- Pruning wrong time: Summer cuts reduce next year’s flowers.
- Poor drainage: Kills more plants than drought.
Troubleshooting Yellow Leaves
| Cause | Symptoms | Fix |
|---|---|---|
| Water stress | Wilting edges | Deep water, mulch |
| Nutrient lack | Veins green | Iron chelate or acidify |
| Root bound (pots) | Stunted growth | Repot larger |
| Cold damage | Brown tips | Protect with hessian |
Why Buy from Bunnings?
Bunnings stocks healthy, locally acclimatised plants with care tags. Their garden centres offer matching mulch, fertilisers, and tools. Return policy covers dud plants.
Final Thoughts
The Bunnings Diamonds in the Dark crepe myrtle is a low-maintenance stunner that rewards Aussie gardeners with minimal fuss. Plant one today, and enjoy its sparkle for decades. Expect first blooms within 12 months of planting.
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