FLOWERING TREE
Black Diamond Lavender Lace Crape Myrtle
Near-black foliage carrying lavender blooms all summer — the darkest-leaved crape myrtle bred, and compact enough for a large pot.
Dark Leaves, Lavender Flowers
Lagerstroemia Black Diamond ‘Lavender Lace’ belongs to a breeding line developed specifically for foliage colour. The leaves emerge and stay a deep burgundy-black through the whole growing season, and against that darkness the soft lavender flower panicles read almost luminous.
It flowers from early summer through to autumn, holds a tidy 2–3 m frame without much pruning, and drops its leaves in winter to show smooth mottled bark. Unlike older crape myrtles it needs no hard annual cutting back to flower well.
Foliage and Flower
The near-black leaf colour is stable — it does not revert to green in summer heat the way many purple-leaved shrubs do. Flower panicles are 15–20 cm long in a clear soft lavender, produced in successive flushes from June until the first cold nights.
Key Features
✓ Near-black foliage that holds colour all season
✓ Lavender panicles from early summer to autumn
✓ Compact 2–3 m — suits large pots and small gardens
✓ Smooth mottled bark for winter interest
✓ No hard annual pruning needed to flower
✓ Very tolerant of hot, dry Indian summers
🌱 Recommended Potting Mix
Light on garden soil, strong on compost — heavy soil chokes crape myrtle roots.
Crape Myrtle
Potting Mix
Potting Mix
25% Garden Soil
What is Garden Soil?
Clean, fertile and loose topsoil collected from a healthy garden or cultivation area.
- Loose and easy to crumble
- Free from stones and waste
- Not extremely hard or sticky
- Able to drain excess water
- Loamy soil is preferred
If your garden soil is sticky or clay-heavy, increase the river sand or perlite share and reduce the cocopeat by the same amount.
30% Cocopeat
Holds moisture, keeps the mix light.
25% Vermicompost
Slow-release nutrients and microbes.
15% River Sand
Drainage channels; stops compaction.
5% Bone Meal
Slow phosphorus for roots and blooms.
Pro Tip: Give it the sunniest spot you have. Shade means fewer flowers and duller leaf colour.
Growing and Care Guide
Simple essentials for healthy and balanced growth.
Sunlight
Full sun — 6 to 8 hours daily. Both the dark foliage and the flowering depend on it.
Watering
Water deeply twice a week in summer, letting the top few centimetres dry between waterings.
Soil
Fertile, well-draining loam. It is not fussy, but standing water will kill it.
Temperature
Flowers freely at a summer daytime 25°C to 32°C, and keeps blooming above that as long as it is watered. Keep it above 8–9°C in winter. A cool summer, not heat, is what stops it flowering.
Fertilizer
A balanced flowering-plant feed in early spring and again after the first flush.
Pruning
Light shaping in late winter only. Remove crossing branches and spent flower heads.
Temperature Tolerance
What this plant enjoys, what it merely survives, and where it stops.
Ideal range
25°C – 32°C
Summer daytime temperature. Through the hot months a day may sit at 25°C, 30°C or 32°C — anywhere across that band and the tree flowers freely. A cool summer is the usual reason a crape myrtle grows well but refuses to bloom.
Active growth
Winter minimum 8–9°C
Do not let it drop below 8–9°C in winter. The tree is deciduous and rests through the cold, but sustained cold under this holds it back and delays the next season’s flowering.
0°C
9°C
25°C
32°C
42°C
46°C
Cold stressChilling injurySafe but slowIdealActive growthWarm — tolerable
❄️ Cold limits
Below 8–9°C
Too cold to push on
The tree rests rather than grows. It is not in danger, but it will not flower until the warmth returns.
Brief light frost
Mature plants only
An established plant takes a short light freeze without lasting harm. Young plants must be protected — they have not built the woody frame that carries an older tree through it.
🌡️ Heat limits
Above 32°C
It keeps flowering
Crape myrtle goes on blooming right through intense, prolonged heat — this is a tree that requires hot summers to do well. No source anywhere gives an upper temperature limit for it. Across India heat is never the constraint on this plant; a cool summer is.
Heat with dry soil
Blooms fade in days
The one condition heat needs is water. When the soil runs dry in high temperatures, each flower starts losing its looks after 4 to 7 days instead of holding on. Keep it watered through peak summer and the display carries on.
Figures from PlantsHub’s own experience growing this tree in India — the 25–32°C summer daytime range and the 8–9°C winter minimum are ours, not a paper’s. No research or extension source publishes a flowering temperature for Lagerstroemia indica at all; the US ones give only winter survival figures, which say nothing about whether it will bloom here. That it keeps flowering through extreme heat when watered, and that blooms fade in 4–7 days when heat meets dry soil, are from NC State Extension and UGA Extension C944. Light-frost note from Top Tropicals; the hot-humid-summer requirement from Useful Tropical Plants.
Climate Zone Compatibility
Where this plant performs across India’s growing zones.
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Cold hardiness
Keep above 8–9°C in winter
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Optimal growth temp
25°C – 32°C summer days
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Winter dormancy
Yes — drops leaves in winter
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Heat stress above
None — it wants the heat
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Ideal Indian zones
Z3 · Z4 · Z5 · Z6 · Z7 · Z8 · Z9 · Z12 · Z16
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Temperature range
8°C to 42°C
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✅ Ideal — thrives here
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Z3 — Subtropical Hills · Winter down to 3–8°C / Summer up to 28°C
Elevation 1,500–2,500m · Rainfall 800–2,500mm · Monsoon 4–5 months · Full dormancy — best colour
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Z4 — Subtropical Highland · Winter down to 0–8°C / Summer up to 33°C
Elevation 1,200–2,200m · Rainfall 500–3,600mm · Mixed monsoon · Dormancy sufficient at elevation
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Z5 — Subtropical Monsoon · Winter 8–14°C / Summer up to 38°C
Elevation 50–600m · Monsoon 5–6 months · Rainfall 1,800–4,000mm · Humidity 75–95%
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Z6 — Subtropical Monsoon Highland · Winter 10–13°C / Summer up to 32°C
Elevation 800–1,400m · Monsoon 5–6 months · Rainfall 1,500–3,200mm · Dry season 5–6 months — no frost ever
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Z7 — Humid Subtropical · Winter 8–15°C / Summer up to 42°C
Elevation 100–700m · Dry season 3–4 months · Rainfall 800–2,200mm · Summer hot — 38–42°C
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Z8 — Subtropical Semi-Arid · Winter 5–12°C / Summer up to 44°C
Elevation 10–200m · Dry season 7 months · Rainfall 400–800mm · Semi-arid steppe
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Z9 — Cool Tropical Highland · Winter 5–12°C / Summer up to 28°C
Elevation 1,600–2,500m · Nilgiri Hills / Western Ghats · Rainfall 1,500–3,000mm · Monsoon 5–6 months
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Z12 — Tropical Wet & Dry Savanna · Winter 11–17°C / Summer up to 40°C
Elevation 300–1,000m · Dry season 5–6 months · Rainfall 700–1,600mm · Deccan Plateau — distinct wet and dry seasons
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Z16 — Subtropical Hot Semi-Arid Continental · Winter 4–13°C / Summer up to 48°C
Elevation 100–450m · Dry season 6–7 months · Rainfall 600–900mm · Summer scorching — 44–48°C peak
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⚠️ Workable — grows, but needs help
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Z2 — Cold Hills · Winter down to 1–5°C / Summer up to 25°C
Elevation 1,800–3,000m · Rainfall 700–4,000mm · Monsoon 4–5 months · Full dormancy — excellent vigour
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Z10 — Tropical Mid-Elevation Monsoon · Winter 9–15°C / Summer up to 38°C
Elevation 600–1,500m · Monsoon 6–7 months · Rainfall 2,500–6,000mm · Humidity 80–95%
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Z11 — Tropical Monsoon Coastal · Winter 14–24°C / Summer up to 38°C
Elevation 0–200m · Monsoon 5–6 months · Rainfall 1,400–4,000mm · No frost ever
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Z13 — Tropical WDS Hot Interior · Winter 11–18°C / Summer up to 48°C
Elevation 200–700m · Dry season 6–7 months · Rainfall 700–1,600mm · Summer scorching — 45–48°C peak
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Z14 — Tropical Wet & Dry Savanna Coastal · Winter 17–22°C / Summer up to 42°C
Elevation 0–400m · Dry season 4–5 months · Rainfall 700–2,000mm · Coastal — humid year-round
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Z15 — Tropical Semi-Arid · Winter 12–16°C / Summer up to 45°C
Elevation 450–600m · Humidity 35–75% · Rainfall 600–900mm · Dry season 7 months
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Z17 — Subtropical Hot Arid · Winter 5–12°C / Summer up to 50°C
Elevation 200–300m · Dry season 9–10 months · Rainfall <400mm · True desert climate
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Z18 — Tropical Hot Semi-Arid · Winter 16–20°C / Summer up to 46°C
Elevation 300–800m · Dry season 7–8 months · Rainfall 500–700mm · Western Ghats rain shadow
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❌ Not suitable
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Z1 — Cold Alpine · Winter down to −20°C or below / Summer up to 20°C
Elevation 3,000–5,500m · Rainfall <300mm · Dry season 8+ months · Deep dormancy — hardiest conditions
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Season by Season
Spring (Feb – Apr)
Dark new leaves push out. Feed now and shape lightly if needed.
Summer (May – Jun)
First flower flush opens. Water deeply — in high heat with dry soil the blooms fade in 4 to 7 days, but kept watered the tree carries on flowering.
Monsoon (Jul – Sep)
Peak flowering. Ensure drainage — this plant hates waterlogged roots.
Autumn (Oct – Nov)
Final flush, then leaves colour and begin to drop.
Winter (Dec – Jan)
Fully dormant and bare. This rest drives next season’s flowering.
How to Plant
01. Pick the sunniest spot in the garden or a large pot on an open terrace.
02. Dig a hole twice the width of the root ball.
03. Add the recommended potting mixture.
04. Set the plant at the same depth it was in its nursery pot.
05. Firm the soil and create a shallow watering basin.
06. Water deeply and mulch to hold moisture.
Frequently Asked Questions
Will the leaves stay black in Indian heat?
Yes. Colour stability is exactly what this line was bred for — it does not turn green in summer the way older purple-leaf varieties do.
Does it need cold winters to flower?
It flowers better after a proper dormant rest, so hill and north Indian gardens get the best show. It still flowers in warmer zones, just a little less heavily.
Can I grow it in a pot?
Yes — a 45 cm or larger pot suits its compact frame. Keep it in full sun and water deeply.
When should I prune?
Late winter, and only lightly. Hard topping ruins the natural shape and is unnecessary with this variety.
The Darkest Leaves in the Garden
Lavender flowers all summer against near-black foliage, on a tree small enough for a terrace.
Leaf colour intensity, flowering time and plant size may vary depending on plant maturity, climate, sunlight, nutrition, soil and local growing conditions.
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