Gleditsia triacanthos f. inermis seeds - Thornless honey locust

Thornless Honey Locust (Gleditsia triacanthos f. inermis), also known as the thornless locust or Christ's thorn, is an ornamental tree that can be propagated from seed. It is prized for its delicate foliage, graceful silhouette, and absence of thorns. Stunning as a standalone specimen, this essential tree adapts to all types of soil and many climates.

Belonging to the Fabaceae family, the Thornless Honey Locust is a thornless variety of the Gleditsia triacanthos species, native to eastern North America. The name "Gleditsia" pays homage to the German botanist Johann Gottlieb Gleditsch. This deciduous tree exhibits rapid growth, typically reaching 20m in height with a spread of 10m. Its crown is broad and irregular, providing dappled shade with its fine, lacy foliage. The alternate and compound leaves measure between 15 and 20cm long and consist of small, ovate leaflets 2.5 to 4cm in length. They emerge light green in spring, turn dark green in summer, then take on a golden-yellow colour in autumn before falling. Flowering occurs in June-July, with small greenish flowers in pendulous clusters 5 to 7cm long. These inconspicuous flowers are nectar-rich and attract pollinators. Pollination is mainly carried out by insects. The fruits are flat, curved pods, measuring between 15 and 40cm long, turning dark brown when ripe in autumn. These pods contain a sweet pulp favoured by wildlife. The trunk and branches of this honey locust are thorn-free, making it ideal for high-traffic areas. The bark is grey-brown, developing longitudinal fissures with age. The root system is deep, with a main taproot and some lateral roots, giving the tree good stability and drought resistance.

It is best to plant Gleditsia triacanthos f. inermis as a standalone feature in a spacious garden, where it will provide light shade without hindering the growth of nearby plants. This highly adaptable tree thrives in rich, moist soil, even poorly drained, and tolerates dry summer conditions, poor or chalky soils once well established. You can pair it with Persian ironwood (Parrotia persica), ornamental grasses like Miscanthus, and perennials such as Japanese Anemones that bloom in late summer, to extend the garden's visual interest.