Gleditsia triacanthos
Honey locust
Common names: Thorny locust
At a glance
- Light
- Full sun
- Hardiness
- Hardy
- Pruning
- Jan–Feb
- Flowering
- May–Jun
Photo: Kevmin · CC BY-SA 3.0 · Source
Description
The honey locust (Gleditsia triacanthos) is a summer‑green tree in the legume family with finely feathered, light green foliage that resembles ferns and turns golden‑yellow in autumn. It is valued as a street tree for its exceptional hardiness, tolerating heat, drought, and compacted soil, making it common on roads and in parks. The wild form bears strong, branching thorns on the trunk and branches, while cultivated varieties such as 'Sunburst' are thornless and grow more compactly. The leathery, dark‑brown seed pods often hang on the tree into winter and are a distinctive identifying feature.
Care instructions
Plant the honey locust in a location that receives full sun to partial shade, allowing ample space as mature trees become tall. It has few soil requirements, provided the ground does not stay permanently wet; sandy to loamy soils are equally suitable. During the first two to three years, regular watering during dry periods helps establishment, after which it tolerates drought well. Prune in late winter (February to week 8) to remove dead or crossing branches; heavy pruning is usually unnecessary. For the thorny wild form, use sturdy tools and thick gloves during pruning; cultivated thornless varieties are easier to maintain.
The care notes were machine-translated from German.
Garden year
FloweringMay–Jun
Soil & site
Soil pH
Soil type
well-drained, loamy, dry, nutrient-rich
Honey locust is surprisingly undemanding when it comes to soil and also tolerates compacted urban soils. It likes free-draining to loamy conditions and copes well with dry spells once established. You should avoid waterlogging, because it reacts more sensitively to that than to drought. It prefers slightly alkaline to neutral soils, but also tolerates poor ground.
Feeding
Light feeder
As a robust deep-rooted tree, honey locust manages without regular feeding. A dose of compost in spring is entirely enough to help young trees establish. On poor sites you can work some well-rotted compost into the root zone in the first year in place; after that the tree looks after itself.
Pruning
In the first years, formative pruning is worthwhile to build a stable crown structure with well-spaced main branches. Prune in late winter, when the tree is still leafless and wounds can heal well before bud break. With older trees it is enough to occasionally remove dead or crossing branches.
Overwintering
Honey locust is completely hardy in Central Europe and needs no winter protection. Young trees in their first one to two years in place benefit from a mulch ring over the root zone, which protects the soil from frost. Older specimens come through the winter without any preparation.
Propagation
Methods
- From seed
- Grafting
Sowing works best with seeds that have been scarified beforehand or scalded with hot water, as the hard seed coat otherwise delays germination considerably. After this treatment, the seeds germinate reliably in spring at warm temperatures. Grafted cultivars, such as thornless forms, are grafted onto seedling rootstocks so that offspring come true to type. For the home garden, buying a pre-grown, thornless cultivar is usually the more relaxed choice.
Companion planting
Good neighbors
cabbage family (Brassicaceae)
particularly well establishedLeguminous plants collect nitrogen in the soil, from which Brassicaceae benefit as heavy feeders.
For example White cabbageKohlrabiRadishKalebroccolicauliflower and 41 more species in the catalogue
Source: classic companion planting (DACH-Gartenpraxis)
carrot family (Apiaceae)
Peas and beans provide carrot and celery with nitrogen and grow as shallow-rooted plants without competition next to each other.
For example CarrotCeleriacDillParsleyFlorence fennelCoriander and 21 more species in the catalogue
Source: classic companion planting (DACH-Gartenpraxis)
Rather not
amaryllis family (Amaryllidaceae)
particularly well establishedAllium species inhibit the nitrogen‑fixing rhizobia of legumes through their root exudates, which slows their growth.
For example GarlicOnionLeekChivesWild daffodilRocambole and 12 more species in the catalogue
Source: basic crop‑rotation rule
Companion planting is partly traditional gardening lore. Where the reason is known, it is given.
Some of these explanations were machine-translated.
For your garden
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