Paulownia tomentosa Seeds | Royal Empress Tree
LATIN NAME: Paulownia tomentosa
COMMON NAME: Royal Paulownia, Empress Tree, Princess Tree
Plant Profile
Beginners confuse it with the catalpas, which also bear big heart leaves. The giveaway is the flower and the fruit: catalpa blooms in upright white clusters after the leaves appear and carries long, bean-like capsules, while paulownia blooms before leaf-out in violet trumpets and releases clouds of tiny winged seeds from small, woody oval capsules — a single tree can produce millions of them, a fact that explains both its weediness in some regions and its eagerness to colonize disturbed ground.
The genus honors Anna Pavlovna, daughter of Tsar Paul I of Russia and Queen of the Netherlands — hence “Paulownia”. The physician and plant collector Philipp Franz von Siebold, working at the Dutch trading post of Dejima in Japan, sent the tree to European horticulture in the 1830s, and it caused an immediate sensation: nurserymen in England and the Low Countries auctioned saplings at extraordinary prices. In East Asia its pedigree ran far deeper — Japanese tradition holds that a kiri tree was planted when a daughter was born and cut for her wedding chest, and the crest of the office of Japan’s prime minister is a stylized paulownia flower.
Site honestly: in favorable climates the tree self-sows with enthusiasm, so in North America and Europe it is best kept where its seedlings can be mowed, away from wildland edges. For timber or foliage display, coppice young trees to a stump after establishment and train a single straight leader from the resulting shoots — this is how plantation trunks stay clean and how the giant-leaf look is preserved. Remove lower branches early, since scars close slowly; thin the crown only in winter.
Science & Biotechnology
Because fast growth is the whole business model, the genus has become a genomics workhorse: chromosome-level genome assemblies of paulownia species are published, marker work tracks drought tolerance, and breeding programs select for straight stems and frost hardiness. Extract chemistry adds another line — leaf and wood extracts are studied for antimicrobial and antioxidant behavior — though no single “active” compound has replaced the tree’s core value as rapid, light timber.
Uses & Benefits
In late April, a mature emress tree does something no other large temperate tree attempts: it opens thousands of violet-blue, trumpet-shaped flowers on bare branches before a single leaf has unfurled, so the whole crown glows like a lavender chandelier while the streets below are still wintry. The flowers smell of vanilla and honey, fall intact by the thousands within a short blooming window, and carpet the pavement purple beneath the tree. Anyone who has seen this spectacle understands why the species was named for royalty and why nineteenth-century gardeners paid small fortunes for it.
The leaves are the tree’s second party trick. On a young or repeatedly cut plant they grow enormous — commonly half a metre across, on vigorous shoots wider than a dinner plate — heart-shaped, soft-furred on both faces, and pale green. Foresters exploit this: cut a paulownia to the ground and the regrowth is a thicket of monster leaves on fast shoots, so vigorous that the tree behaves like a woody crop. Left alone, it forms a broad-crowned deciduous tree to fifteen metres or more, with Opposite, cordate leaves on long petioles and twigs studded with rusty, tomentose buds through winter.
The wood is the lightest commercial timber of any broadleaf tree in common trade — roughly a third lighter than most softwoods — yet dimensionally stable, and it neither splits nor rings. That combination made paulownia the classic soundboard wood for the Japanese koto and for the classical Chinese zither family, a use documented for well over a millennium. Modern plantations in China grow the tree on short rotations for furniture cores, surfboards, saunas and packing, and the leaves are harvested as high-protein fodder for livestock in integrated farms.
Paulownia is the reference species for a Chinese agroforestry system: rows of trees spaced widely over wheat fields, with the deep taproots drawing water far below the cereal’s root zone while the late leaf-out means the crop gets full spring sun. Field trials across the North China Plain established the tree-crop geometry decades ago, and the system remains a model studied internationally for semi-arid farmland.
Growing from Seed
The seed is famously tiny — dust-fine wings that ride any draft — and that drives the whole sowing method.
Sow on the surface of a fine, moist, sterile seed mix in a bright, warm place, pressing the seed in without covering it; a misting sprayer, not a watering can, keeps the seed where you put it. Keep humidity high until seedlings show a first pair of true leaves, then vent hard to prevent damping-off — paulownia seedlings are tender as moss at this stage. Prick out once leaves overlap, burying seedlings slightly deep to force stem rooting, and grow them fast: the species responds to feed and water with astonishing speed, reaching plantable size in a single season.
Our Take
Paulownia rewards decisive growers and punishes timid ones — plant it big, cut it hard, and it repays you with speed unmatched by any other tree of cold-winter climates. For close comparisons, see the Paulownia fortunei seed profile on the taller Chinese timber species, or the Catalpa ovata seed guide for the lookalike with the bean pods. The Catalpa bungei seed page covers the compact, columnar Chinese catalpa for smaller sites.
Related Reading
Readers interested in Royal Paulownia frequently explore these as well: