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Tree · Fabaceae family

Honey locust

Gleditsia triacanthos

Full sun in a garden 4–6 m × 3–4 m to −40 °C

In short a 10-second read

SunFull sun
in a garden after 10 years4–6 m
in the wild up to 20 m
spacing 10 m
PlantingMarch–April, October–November
WinterNo winter protection
Watched as potentially invasive (DE) — keep it away from the wild and do not let it spread.

Where to plant and how much to water

Sun, soil and water.

It grows best in full sun, in dry to average soil.

Sun

Sun6 hours or more
Part shade3–6 hours
Shadeunder 3 h

Soil

tolerates any pH
acidicneutralalkaline
dry to averageloamysandyclay

Watering

at the base, not on the leavesdrought tolerant once establishedless when it rains

Frost

−40 °C
no winter protectionleafless in winter

How much space it takes

Mature size.

The mature plant next to a person (175 cm).

1 m2 m3 m4 m5 m6 m7 m8 m9 m10 m11 m12 m13 m14 m15 m16 m17 m18 m19 m20 m15–20 mspread 10–24.5 m
15–20 m× spread 10–24.5 m

Plant 10 m apart.

Reaches maturity in about 20–50 years. The final size depends on the cultivar and the spot — we give the range from smallest to largest.

Calendar

Through the year.

Months for Central Europe. The line shows the current month.

The year at a glance

Planting: JanuaryPlanting: FebruaryPlanting: MarchPlanting: AprilPlanting: MayPlanting: JunePlanting: JulyPlanting: AugustPlanting: SeptemberPlanting: OctoberPlanting: NovemberPlanting: DecemberFeeding: JanuaryFeeding: FebruaryFeeding: MarchFeeding: AprilFeeding: MayFeeding: JuneFeeding: JulyFeeding: AugustFeeding: SeptemberFeeding: OctoberFeeding: NovemberFeeding: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
PlantingFeeding
Now, in October: a good time for planting (container plant, bare-root, root-balled).
JanFebMarAprMayJunJulAugSepOctNovDec

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

container plant: March–April, October–November; bare-root: March–April, October–November; root-balled: March–April, October–November

Feeding

JanFebMarAprMayJunJulAugSepOctNovDec

May–June

Feeding

Nutrition.

Horn meal

up to 55 g/m² a year, if the soil needs it · May–June

JanFebMarAprMayJunJulAugSepOctNovDec

Pests and diseases

Common problems and what to do.

The most common problems in Central Europe. Protection is listed from the gentlest option.

High riskMedium riskLow riskRisk for this plant according to the source · no label = no documented level

What you will see

White powdery patches on leaves, stems and flowers, often on the upper side of the leaf; leaves stunted or distorted.

The source says: honey locust is susceptible to powdery mildew, among others.

When to look

From spring onwards

How to protect

  1. Prevention
    • Plant in sun; avoid still, enclosed spots by a wall or fence.
    • Water in dry spells; do not overdo nitrogen feeding.
    • Thin the crown and water at the roots in the morning.
    • In autumn, collect and destroy affected fallen leaves (reduces spores in spring).
  2. By hand as soon as noticedCut off affected shoots straight away and clean your tools. Fungicides are not recommended.
Powdery mildewsdisease · from spring onwardsMedium risk

What you will see

White powdery patches on leaves, stems and flowers, often on the upper side of the leaf; leaves stunted or distorted.

The source says: honey locust is susceptible to powdery mildew, among others.

When to look

From spring onwards

How to protect

  1. Prevention
    • Plant in sun; avoid still, enclosed spots by a wall or fence.
    • Water in dry spells; do not overdo nitrogen feeding.
    • Thin the crown and water at the roots in the morning.
    • In autumn, collect and destroy affected fallen leaves (reduces spores in spring).
  2. By hand as soon as noticedCut off affected shoots straight away and clean your tools. Fungicides are not recommended.
More about this problem

Fall webworm

pest

What you will see

Large web nests at the ends of branches with caterpillars, eaten leaves and droppings. Eggs in white hairy clusters on the underside of leaves.

When to look

Summer – autumn

How to protect

  1. Prevention
    • Encourage birds, predatory insects and parasitoids.
  2. By hand late summer – early autumnCut off affected branches with nests and destroy them while the nests are small.
  3. Chemical — only when nothing else helps according to the authorisationOnly a product authorised in your country against: fall webworm caterpillars; treat only the nest and the leaves around it while the caterpillars are small.
Fall webwormpest · summer – autumn

What you will see

Large web nests at the ends of branches with caterpillars, eaten leaves and droppings. Eggs in white hairy clusters on the underside of leaves.

When to look

Summer – autumn

How to protect

  1. Prevention
    • Encourage birds, predatory insects and parasitoids.
  2. By hand late summer – early autumnCut off affected branches with nests and destroy them while the nests are small.
  3. Chemical — only when nothing else helps according to the authorisationOnly a product authorised in your country against: fall webworm caterpillars; treat only the nest and the leaves around it while the caterpillars are small.
Sources (3)

Frequently asked

Quick answers.

Does honey locust tolerate shade?

No, it needs full sun.

How much space does honey locust need?

At maturity 10–24.5 m wide and 15–20 m tall; recommended spacing 10 m.

Powdery mildews — what can you do?

Plant in sun; avoid still, enclosed spots by a wall or fence. Cut off affected shoots straight away and clean your tools. Fungicides are not recommended.

Fall webworm — what can you do?

Encourage birds, predatory insects and parasitoids. Cut off affected branches with nests and destroy them while the nests are small.

Sources (16) Checked 24 October 2026

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