Brugmansia suaveolens Seeds | Angel’s Trumpet
LATIN NAME: Brugmansia suaveolens
COMMON NAME: Angel’s Trumpet
Plant Profile
Here is the oddity: a plant grown in millions of gardens has no well-documented wild range. Brugmansia suaveolens is treated by several botanists as a hybrid derivative of two other Andean species, Brugmansia aurea and Brugmansia versicolor, which is why genuinely wild populations are so hard to pin down even though the plant has been in cultivation since before European contact. It is naturalised in southeastern Brazil and across the wet tropics, and thoroughly at home in a pot on a patio.
Moth-pollinated flowers are usually pale and tubular, with a strong night scent, and these are all three. The reward is nectar rather than pollen, and the moth carries pollen on its body from one hanging trumpet to the next. Where the moths are absent, a container plant relies on hand pollination.
The two genera were separated long ago and the difference is easy to see. Brugmansia is a woody shrub or small tree with pendulous, trumpet-shaped flowers and a smooth unarmed fruit; Datura is herbaceous, holds its funnel flowers upright, and produces a spiny capsule. The genus name honours Sebald Brugmans, an eighteenth-century Dutch botanist. Both genera carry the same tropane alkaloids, and both are dangerous.
The soft new growth is a magnet for whitefly, aphids and spider mite. Check leaf undersides and wash pests off before a population builds. Virus disease is the bigger problem: potyviruses such as Brugmansia suaveolens mottle virus and other mosaic-type infections disfigure the foliage and spread with sap and with insect feeding, so never propagate from a plant with mottled, crinkled or streaked leaves.
Science & Biotechnology
The chemistry is the tropane alkaloids. In this genus scopolamine usually dominates, with hyoscyamine present and atropine appearing as hyoscyamine racemises in stored material. The biosynthetic route runs from the amino acid ornithine through putrescine and N-methylputrescine to tropinone, which tropinone reductase reduces to tropine; tropine is then esterified with tropic acid to hyoscyamine, and hyoscyamine 6-beta-hydroxylase adds the oxygen that turns it into scopolamine. The plant runs a particularly active version of that final enzyme.
Because scopolamine is a licensed medicine, used in transdermal patches for motion sickness and in premedication before surgery, its production has been pursued biotechnologically. Hairy-root cultures induced with Agrobacterium rhizogenes grow alkaloid-producing root tissue in bioreactors, and the H6H gene has been over-expressed in several solanaceous hosts to shift the pathway toward scopolamine.
Uses & Benefits
The flowers hang downward like long bells, open white, and stay fragrant only at night, which is the pollination logic of the plant: the corolla tube is long and narrow, the nectar sits at the bottom of it, and the scent is released after dusk to advertise the reward to hawkmoths, whose tongues are long enough to reach it. Walk past the plant in the evening and you smell it; by midday the perfume is largely gone.
All parts contain tropane alkaloids, most concentrated in leaves, flowers and seed. Poisonings are usually accidental: a child chews a flower, or someone brews a tea from the leaves. The effects are the classic anticholinergic picture of dilated pupils, dry mouth, rapid heartbeat, confusion and hallucinations, and they can persist. Grow it for the flowers, keep it out of reach of children and animals, wear gloves when pruning, and never bring any part of it into the kitchen.
Growing from Seed
In a frost-free climate it grows into a small tree. Elsewhere, keep it in a large container with a fertile free-draining mix and move it under cover before the first frost. It can be cut back hard in autumn and held cool and barely moist, frost-free, through the winter, and it will resprout from the base in spring. Feed and water generously through the growing season, because flowers come on new stems.
Sow on the surface of a moist sterile mix and press the seed in, covering it only with a dusting of fine material; a clear cover keeps humidity up until the seedlings stand. Once the first pair of true leaves has opened, lift them into individual pots. They grow fast and want potting on repeatedly, so pinch the growing tip when the stem has made several leaf pairs, and move the plant outside only after the nights are reliably warm.
Our Take
Angel’s trumpet is the most dramatic plant you can grow in a pot, and the etiquette of growing it is simple: keep it out of reach and enjoy it after dark, when the flowers do their work. If you like the shape but want something smaller, thorn apple is the herbaceous cousin and henbane carries the same alkaloids in a compact plant, while mandrake belongs in the same historical company. Nicotiana gives you a night-scented flower without the toxicity problem.
Related Reading
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