Gleditsia triacanthos f. inermis

Gleditsia triacanthos f. inermis
Gleditsia triacanthos f. inermis 
honey locust - thornfree
SIZE/TYPE medium-sized tree
LEAVES deciduous broadleaf
COLOUR OF LEAVES light green
FLOWERS insignificant or non-blooming
LOCATION full sun
SOIL TYPE any (acidic to alkaline)
SOIL MOISTURE REQUIREMENTS evenly moist (dislikes drought)
USDA zone (lowest) 4   (down to -34°C)
FOR ZONE 5+6 Code of winter protection zone 5+6
FOR ZONE 7 Code of winter protection zone 7
BELONGS TO CATEGORIES Deciduous broadleaf
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Inermis is a very elegant forma of honey locust with no thorns! They can be found on the species, not on this plant, and are very dangerous, so nothing to worry about here.

It has bright green, fern-like leaves that are pinnate and bipinnate, both types often occurring on the same tree. They are 20-25 cm long and make the plant look almost exotic. The foliage is dramatic in autumn when it turns bright golden-yellow. In mid spring appear bright green flowers composed in short catkin-like racemes. They are fragrant - they smell like ginger-bread, and are highly melliferous which makes the tree one of the most important for beekeepers .

It is a medium or large tree with a crown, or it can be sparsely branched from the base. In 20 years it will grow about 6-8 meters tall. The canopy of young trees makes an open V shape, and with age it opens wider and the branches change to almost horizontal. Even when the tree is densely foliaged it provides so-called filtered sunlight i.e. does not make a dark shade, thus allowing shrubs and other plants which prefer partial shade live underneath.

Another advantage of this beautiful tree is its adaptability. It is soil and pollution tolerant, and can live happily in urban areas with limited moisture in summer, and practically no fertilizing. Though, in private gardens it will be grateful for moist, deep, fertile soil. Honey locust needs a sunny location. Fully hardy to -40°C (USDA zone 3).

Last update 03-02-2008; 02-01-2019
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Gleditsia triacanthos f. inermis height of stem 210-220 cm, girth 12-14 cm

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Gleditsia triacanthos (var. inermis)
  • STANDARD QUALITY - Plants of this group are 1st class quality with number of branches and overall density adequate to their size and age, considering they were container grown.
  • DE LUXE QUALITY - This label guarantees a luxurious quality of manually selected plants that, compared to their height and age, are exceptionally dense and beautiful.
  • EXTRA - These plants are usually mature and bigger specimens with exceptional overall appearance.
  • STANDARD (as described in the plant form) means a tree with a trunk of 190-210 cm and a crown at the top, unless specified differently. The commercial size for trees is their girth measured in the height of 1m from ground.
  • HOBBY - These plants are of the same quality as our standard-quality plants but younger and therefore cheaper.
  • SHRUB - a woody plant with branches growing bushy from the ground level.
  • HALF-STANDARD or MINI-STANDARD - a small tree with shorter trunk, its size is usually specified.
  • FEATHERED - These are trees with branches growing already from the base of the trunk and up along the stem.
  • GRASSES and PERENNIALS - Sizes given usually read the diameter of the pot or the clump, as specified.
LARGE PLANTS over 150 cmspecimens, screening and hedging shrubs

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