Why is London Plane used as a street tree?

London Plane is tough, tolerating air pollution, compacted soil, pruning, and urban stress better than most trees. Its distinctive mottled bark (shedding in patches to reveal lighter inner bark) and deciduous nature provide both summer shade and winter light.

What diseases affect London Plane?

Plane Anthracnose is the primary disease, causing branch dieback and defoliation. However, Peninsula London Planes often shed the affected branches and recover. The disease is more serious in humid climates than on the dry Peninsula.

Is London Plane protected?

London Plane is not native and falls under general tree protection ordinances. Protection status varies by city. Check your city's ordinance for specific protection thresholds and requirements.

London Plane Tree

Platanus × acerifolia

Non-Native (Hybrid) Deciduous Top Street Tree Allergy Concern

Mature Height

70–100 ft

Canopy Spread

60–80 ft

Growth Rate

Fast

Lifespan

200–400 years

Water Needs

Moderate

Key Concerns

Anthracnose, allergies

How to Identify London Plane Tree

London plane is a hybrid between the American sycamore and Oriental plane tree, bred for urban toughness. It's the world's most planted urban tree and the Peninsula's dominant large street tree — lining downtown streets from Palo Alto to San Mateo.

Distinctive mottled, camouflage bark — outer bark peels in irregular patches revealing cream, olive, and tan inner bark
Large, maple-like leaves 6–10 inches wide with 3–5 broad lobes — shallower lobes than true maple
Spiky ball-shaped fruit clusters 1–1.5 inches, hanging in pairs on long stems (sycamore has singles)
Massive spreading canopy on mature trees — often wider than tall in open settings
Fuzzy trichomes on leaf undersides and young stems — these shed and become a significant allergen

Where It Grows on the Peninsula

London plane dominates Peninsula downtown streetscapes. They line University Avenue in Palo Alto, El Camino Real in multiple cities, downtown San Mateo, and Burlingame Avenue. City public works departments planted them extensively from the 1950s through 2000s because of their tolerance for compacted urban soils, pollution, root disturbance, and aggressive pruning (pollarding). They're also common in parks, parking lots, and commercial landscapes.

Protection Status by City

Protection Status by City
City	Status	Protected Size	Notes
Palo Alto	Protected	≥11.5" circumference	Very common street tree; city manages most public specimens
San Mateo	Significant	≥30" circumference	Lines many downtown streets
Burlingame	Protected	≥48" circumference	Iconic on Burlingame Avenue
Redwood City	Significant	≥38" circumference	Common in downtown and courthouse areas
Mountain View	Protected	Significant specimens	Downtown Castro Street plantings
Menlo Park	Heritage tree	≥15" diameter	Large specimens in parks and streetscapes

Use our Permit Checker for your specific situation.

City permit guides · View map

Dominant street tree — city-managed in most jurisdictions

Redwood City12″ DBH — free permits Mountain View48″ circumference for non-oak San Mateo15″ DBH for non-oaks

Common Issues & Diseases

Anthracnose (Apiognomonia veneta)

The most common London plane disease on the Peninsula. Causes leaf browning, twig dieback, and defoliation — especially during cool, wet springs. In severe years, trees can lose 80%+ of their leaves by June, then re-leaf in July. The disease is cosmetic in most years and doesn't kill the tree, but it's alarming to homeowners who think their tree is dying. Resistant cultivars ('Bloodgood', 'Columbia') are now preferred for new plantings.

Sycamore/Plane Tree Allergy

London plane sheds microscopic trichomes (tiny hair-like structures) from leaves and seed balls. These become airborne and are a significant respiratory irritant and allergen for many people. Peak shedding occurs during leaf-out (spring) and seed ball breakup (late winter). People with asthma or allergies should be aware of proximity to London plane trees.

Canker Stain (Ceratocystis platani)

A serious, often fatal vascular disease spread by contaminated pruning tools. Causes wedge-shaped staining visible in cross-section of cut branches. Tool sterilization is critical. Fortunately still relatively uncommon on the Peninsula but present in California.

Massive Root Systems

London plane roots are powerful and far-reaching. In restricted tree wells, roots can heave surrounding pavement dramatically. The root systems are a constant maintenance concern for city arborists managing street trees.

Peninsula Care Calendar

❄️ Winter (Dec–Feb)

Dormant season — excellent pruning window. Many cities pollard street planes in winter (cutting back to knuckles). Seed ball cleanup. Structural assessment for storm readiness.

🌱 Spring (Mar–May)

Anthracnose season during cool, wet weather. If leaves emerge brown and curled, it's almost certainly anthracnose, not a fatal disease — the tree will typically re-leaf. Trichome shedding at peak during leaf-out — allergy alert.

☀️ Summer (Jun–Aug)

Full canopy provides outstanding urban shade. If anthracnose was severe, second flush of leaves appears. Monitor for canker stain symptoms on pruned branches.

🍂 Fall (Sep–Nov)

Leaves turn yellow-brown before dropping (not as showy as sweetgum or oak). Seed balls persist on tree. Good time for structural pruning. Remove deadwood before winter.

Detailed Notes

Fire Risk

Low — London plane is deciduous with high moisture content, and the thick bark provides fire resistance. One of the safer large trees in fire zones.

Drought Tolerance

Good — London plane tolerates drought well once established, though growth slows in extended dry periods. Deep watering 1–2×/month during severe drought maintains vigor.

Wildlife Value

Moderate. Seed balls attract finches in winter. Cavities in mature trees provide nesting sites for owls, woodpeckers, and parrots (yes, San Francisco's feral parrot flock uses plane trees). The massive canopy provides shade habitat.

Arborist Pro Tips

💡 Pro tip: If your London plane has anthracnose every spring, don't panic and don't pay for fungicide treatments — the tree will re-leaf once warm weather arrives. Treatment is rarely cost-effective for mature trees. The disease is cosmetic.

💡 Pro tip: Pollarding (cutting branches back to the same knuckle points annually) is the traditional pruning method for London planes in urban settings. If done correctly from a young age, it controls size effectively. But NEVER start pollarding a mature tree that hasn't been pollarded before — the result is ugly, structurally weak regrowth.

💡 Pro tip: If someone in your household has respiratory allergies, avoid planting London plane within 50 feet of bedrooms or outdoor living spaces. The trichome shedding is a well-documented allergen and there's no way to mitigate it short of removal.

Where to Find London Plane on the Peninsula

Find ISA-certified arborists experienced with london plane in these cities:

Palo Alto University Avenue and downtown street plantings. San Jose Common downtown and commercial district street tree. Redwood City Downtown streetscape plantings.

Need Help With Your London Plane Tree?

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Written by Michael Schuck, ISA Certified Arborist WE-15750A · Updated February 2026
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🌳 London Plane Tree