Catalpa fargesii Seeds | Farges’ Catalpa
LATIN NAME: Catalpa fargesii
COMMON NAME: Farges’ Catalpa
Plant Profile
Catalpa fargesii carries the name of Père Paul Guillaume Farges, a French missionary who collected plants in the mountains of Sichuan at the end of the nineteenth century and sent home the dried specimens that European botanists were turning into new species. The catalpa that bears his name is one of many Chinese plants pinned down from his gatherings, and the story is a useful reminder that a great share of the garden trees of the temperate world were first described from missionary and embassy collections rather than from settled botanic gardens.
It is easy to confuse the Asian catalpas. C. fargesii differs from C. ovata in its lighter bark and more refined flower, and from C. bungei in its open crown and greater height, while the American C. bignonioides shares the flower shape but grows a broader, shorter canopy. The long persistent pod and the heart leaf are the constant clues; the flower marking is what tells fargesii from the rest at a glance in bloom.
In its home range the catalpa is planted as a street and avenue tree for the summer shade and the showy flower, and the abundant nectar of the panicles makes it a useful bee tree. The long pods are ornamental in winter even if they are a litter problem on a paved street, so the tree suits a park or a large garden more than a tight courtyard.
It wants full sun and a deep, fertile, moist but drained soil, and it is happiest in the warm valley climate of central China that it comes from. It tolerates summer heat that would scorch a temperate ornamental and shrugs off the sort of city pollution that discourages more delicate trees. In a long, hot season it also grows noticeably faster than its American cousin, which is why it is favoured for quick establishment on new avenues and reclamation sites where a screen is wanted within a few years rather than a decade.
Science & Biotechnology
Catalpa species are known for iridoid glycosides, and C. fargesii produces catalpol and related compounds in its leaves and bark. These bitter, defence-oriented molecules are the reason the foliage is largely untouched by browsing animals, and they are the subject of pharmacological interest for their effects on the nervous system in laboratory studies. The wood and leaves also yield flavonoids, so the chemistry is consistent with the genus even if fargesii itself is less studied than the American species.
Uses & Benefits
Micropropagation of Catalpa has moved from the easy American species to the Asian ones, using nodal explants on a balanced medium to multiply selected trees. For fargesii the method matters because the best flowering and form trees are worth cloning, and seed-grown plants vary in crown shape and in how freely they flower. Clean, uniform nursery stock is now routine for the ornamental trade across East Asia.
The timber is pale, light, straight-grained and resistant to decay, which is why catalpa wood has long been valued for carving, for lightweight furniture, and for the bodies of certain musical instruments. It works easily and holds paint and polish, and the fast growth means a usable trunk can be produced in a fraction of the time a hardwood oak would need. That combination of speed and workability is the tree’s quiet economic case.
Growing from Seed
The plant is a medium deciduous tree, commonly six to ten metres in cultivation and occasionally taller in the wild, with the big, soft, heart-shaped, long-stalked leaves that mark the whole genus. The leaves are opposite, sometime also in whorls of three, and they cast a dense, cooling shade. In early summer the tree throws upright panicles of showy white flowers, each marked with purple and yellow streaks inside the throat, followed by the long, slender, bean-like capsules that hang through the winter and rattle in the wind.
The seed is small, flat and winged, carried in the long pod, and it sows best when only lightly covered. Surface-sow or barely press it into a fine, moist seed bed, because the wing and the thin seedcoat mean it does not want to be buried. Fresh seed emerges readily in warmth; older seed benefits from a brief soak. Thin the seedlings to stand about thirty centimetres apart in the seed bed so the young stems thicken rather than etiolate.
Move seedlings to their permanent spot once they carry six to eight true leaves and stand twenty to thirty centimetres, and set them at several metres apart to allow the open mature crown. A single central leader is trained in the early years by removing competing shoots, and a mulch ring keeps the shallow roots cool. The tree asks for little once established and resists the pests that trouble softer ornamentals.
Our Take
I value this one for the white panicles and the winter pods more than for the wood, though the wood is a bonus. For other catalpas see Catalpa bungei, Catalpa bignonioides and Catalpa ovata, each with its own flower and form.
Related Reading
If Farges’ Catalpa appeals to you, these related plants are worth a look: