Angelica sinensis Seeds | Dong Quai
LATIN NAME: Angelica sinensis
COMMON NAME: Dong Quai, Female Ginseng
Plant Profile
The root is lifted in late autumn, when the top growth has yellowed but the crown is still sound. It comes up as a thick, branching taproot with a brown skin and a pale, sweet-smelling interior. In Gansu the roots are traditionally dried slowly over gentle smoke, which darkens the outside and fixes the characteristic aroma.
Botanically the plant is monocarpic, flowering once and then dying, though in a garden it usually behaves as a short-lived biennial or a very brief perennial. Garden angelicas can be left to set their great green umbels and still come back; this one cannot, so the decision to allow flowering is a decision to lose the root.
Ferulic acid is the usual chemical yardstick for quality control in this root, and commercial material is assayed for it alongside ligustilide content. The root also carries polysaccharides and coniferyl ferulate. Batch-to-batch variation is significant, which is why buyers pay attention to origin as much as to appearance.
Many angelicas produce furocoumarins, with psoralen and imperatorin among the well-known examples, and the closely related A. dahurica is particularly rich in them. These compounds interact with ultraviolet light and can cause a phototoxic skin reaction, so handling large quantities of fresh root or oil in strong sun calls for gloves and care.
The crop is traditionally grown high up, on cool slopes with deep, friable soil, in districts where the growing season is short and the air stays humid. Attempts to move it to hot lowlands generally fail, because warmth both speeds the plant towards flowering and produces a thinner, less aromatic root.
Science & Biotechnology
The volatile oil of the root is built around Z-ligustilide, with butylidenephthalide and related phthalides contributing to the warm, celery-like, faintly sweet smell. The ligustilide series takes its name from the related genus Ligusticum, and the same compounds turn up in several umbellifer roots used in East Asian medicine. The smell is strong enough to identify good material at arm’s length.
Because a field crop takes two seasons and can fail at the flowering hurdle, laboratory production has been explored. Hairy root cultures, initiated by the soil bacterium that causes crown gall, grow as a mass of fine transformed roots in a reactor and accumulate ligustilide and related phthalides without any need for soil, weather or a root crop.
Uses & Benefits
The trade divides the crop by district. Roots from Minxian in Gansu are considered the reference grade; material from Yunnan is traded under its own district name; and Sichuan roots make up a third category. The differences are real enough that merchants price them separately, and the districts differ in soil, altitude and drying practice.
Growing from Seed
If a plant is shocked into flowering in its first year, the root it would have built goes instead into a flowering stem and the crop is a write-off. Cold snaps after sowing, transplant shock and dry spells all provoke it. Growers control the risk by sowing into warm soil, avoiding root disturbance and holding the seedlings in a steady, moist bed.
The carrot family contains some of the most dangerous plants in the temperate world, including water hemlock and poison hemlock, and several of them look like young angelicas. Never harvest a wild umbellifer root or leaf for the kitchen or the medicine chest unless you identified it in flower the previous season and are certain of it.
Sow fresh seed on raised ridges of loam enriched with well-rotted compost and a little sand, setting the seed no deeper than a few millimetres and pressing it in. Space the plants thirty to forty centimetres apart in rows half a metre wide, and water gently and regularly, since the young taproot must never dry out or be broken. Move seedlings only when they have four to six true leaves.
Our Take
This is a plant for a cool, moist corner, and it has no patience with dry heat or with being dug up and moved. If your climate runs hot, grow it as a shade-border curiosity for the umbels and the scent rather than for a root crop. Garden angelicas make good companions: garden angelica is bigger and easier, while Angelica dahurica shows the same family chemistry with stronger furocoumarins. Try ashitaba for a leaf crop from the same genus, and lovage if you want that deep umbellifer flavour from a plant you can cut all summer.
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