Japanese: Ivory Silk Lilac
Syringa reticulata
Japanese: Ivory Silk Lilac (Syringa reticulata) is a tree suited to the Colorado Front Range, rated "Recommended" on the 2024 Front Range Tree Recommendation List. It matures to about 15–25 ft tall and 15–20 ft wide, needs low to medium water, and prefers full sun.
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At a glance
- Rating
- Recommended
- Botanical name
- Syringa reticulata
- Variety / cultivar
- Japanese: Ivory Silk
- Type
- Tree
- Mature size
- 15–25 ft tall and 15–20 ft wide
- Mature form
- Oval / upright
- Spacing / clearance
- ~20 ft of clearance
- Hardiness zones
- USDA 3–7
- Growth rate
- Moderate
- Lifespan
- Medium
- Water needs
- low to medium water
- Sun
- Best in full sun.
- Colorado native
- No
- Foliage
- Deciduous
- Soil
- clay, loam, sandy
- Soil pH
- 6.0–8.2
- Hail tolerance
- moderate
- Wind tolerance
- moderate
- Salt tolerance
- moderate
- Bloom color
- cream, white
- Bloom time
- late spring, early summer
- Pollinator value
- moderate
- Tolerates
- Hellstrips / parking strips
Wildlife & ecology
- Pollinator value
- moderate
- Deer
- Generally deer-resistant
Common problems on the Front Range
- Lilac/ash borer
- Powdery mildew (cosmetic, late season)
- Oystershell scale
These are general tendencies for this group of plants on the Front Range, not a diagnosis. Many are stress-driven and preventable with good siting and watering. For a specific plant or an active problem, consult a certified arborist or your local CSU Extension office.
Planting & establishment
Water deeply every 7–10 days through the first 2 summers. Winter water 1–2×/month October–March when soil is dry and unfrozen, winter desiccation is a top killer of newly-planted trees. Year 3: taper to 2×/month in summer, then rely on natural precipitation.
Frequently asked questions
- Is Japanese: Ivory Silk Lilac good for the Colorado Front Range?
- Yes, Japanese: Ivory Silk Lilac is a well-suited tree for Colorado's Front Range, rated "Recommended" on the 2024 Front Range Tree Recommendation List.
- How big does Japanese: Ivory Silk Lilac get?
- It matures to about 15–25 ft tall and 15–20 ft wide.
- How much room does Japanese: Ivory Silk Lilac need?
- Give Japanese: Ivory Silk Lilac about 20 ft of clearance from buildings, fences, and other trees so the mature canopy isn't crowded.
- What shape does Japanese: Ivory Silk Lilac grow into?
- Japanese: Ivory Silk Lilac typically grows into an upright-oval crown, taller than it is wide. This is the species' usual mature form, named cultivars (columnar, weeping, or compact selections) can differ, so check the specific cultivar.
- Is Japanese: Ivory Silk Lilac hardy on the Front Range?
- Japanese: Ivory Silk Lilac is hardy in USDA 3–7. The Colorado Front Range spans roughly USDA 4b–6a, so it is well within range.
- How much water does Japanese: Ivory Silk Lilac need?
- It needs low to medium water once established.
- How fast does Japanese: Ivory Silk Lilac grow?
- Japanese: Ivory Silk Lilac is a moderate-growing tree. Growth rate depends on water and site conditions on the Front Range.
- How long does Japanese: Ivory Silk Lilac live?
- Japanese: Ivory Silk Lilac has a moderate lifespan for a Front Range tree. Actual lifespan varies with site, water, and care.
- Is Japanese: Ivory Silk Lilac native to Colorado?
- No. It is not a Colorado native, but it grows well on the Front Range.
- Is Japanese: Ivory Silk Lilac deer-resistant?
- Japanese: Ivory Silk Lilac is generally considered deer-resistant, though no plant is deer-proof when browse pressure is high.
- Is Japanese: Ivory Silk Lilac prone to pests or disease on the Front Range?
- Japanese: Ivory Silk Lilac can be affected by lilac/ash borer and other issues common to this group on the Front Range. These are general tendencies, not a diagnosis, many are stress-driven and preventable with good siting and watering. For a specific plant or an active problem, consult a certified arborist or CSU Extension.
