Heteropanax fragrans Seeds | Fragrant Heteropanax
LATIN NAME: Heteropanax fragrans
COMMON NAME: Fragrant Heteropanax
Plant Profile
The Fragrant Heteropanax is a tall, straight, evergreen tree of the ginseng family from the warm lowland forests of southern China and mainland Southeast Asia, and in the wild it is a forest-edge giant: a clean trunk rising ten to fifteen metres before the enormous, twice-divided leaves spread at the crown like a stack of umbrellas, each whole leaf up to a metre across. In autumn the branch ends carry large, rounded heads of small, yellow-green flowers with a sweet, heavy scent that carries across a garden in the evening.
The flower heads stand well above the foliage, and their late-season timing puts the nectar flow where few trees have one. In its home lowlands it is a wayside, campus and village tree as much as a forest species, planted for shade and scent.
Science & Biotechnology
Its place in the ginseng family, Araliaceae, has been settled by the molecular revisions that stabilised the family, and its bold compound-leaf architecture is the family’s recurring design at its largest. Its autumn flowering has been recorded in phenological surveys of southern Chinese and Indochinese lowland flora as a significant late-season nectar resource, out of step with the spring calendar of the surrounding forest, and the scent that gives the species its name is noted in the same records. Its leaf litter is heavy and quick to break down, and forest-floor studies of its stands note the rich humus layer that builds beneath it.
In cultivation outside Asia it is a collector’s tree, and most stock traces to southern Chinese seed, though its behaviour in warm Western gardens has matched its Asian record: fast, straight, undemanding.
Uses & Benefits
In the landscape it is a shade and scent tree for warm climates: a fast, straight canopy whose umbrella leaves give bold, tropical-scale foliage and whose autumn flower heads feed bees and carry perfume through the evening. It suits campuses, avenues and large gardens in frost-free or near-frost-free regions.
The flowers are a genuine ecological service at an unfashionable hour, and the heavy leaf fall builds soil beneath the tree faster than most evergreens manage. Its uses are the forest’s own: shade, scent, soil and a nectar flow where the calendar has none.
Growing from Seed
Sow fresh seed into a light, humus-rich mix, covering it thinly and keeping it at 24 to 28 °C with even moisture in bright shade; germination follows within a few weeks. Pot the seedlings on early and grow them in bright filtered light with steady water, since the young plants make fast root and fast top growth alike.
Plant out into deep, rich, moist, well-drained soil in full sun or light shade, spacing for a fifteen-metre crown, and water through the first two seasons. Stake the young trees for their first three years, then let the umbrellas open; flowering follows within five to seven years of planting.
Our Take
The autumn-flowering umbrella tree: metre-wide compound leaves, evening-scented flower heads and a nectar flow at the year’s unfashionable end. Fast, straight and undemanding.
Related Reading
More species in the same orbit as Fragrant Heteropanax: