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Asparagus Root

천문동 (天門冬) · Asparagus cochinchinensis (Lour.) Merr.
Yin-tonifying herb Cold Bitter, sweet Lung, Kidney
NatureCold
TasteBitter, sweet
MeridiansLung, Kidney
Part usedRoot
FamilyAsparagaceae
CategoryYin-tonifying herb
Find by concern: Dry coughThirst

Overview

Asparagus root is a cooling yin-tonic long paired with its close relative Liriope (maekmundong) in traditional formulas for dry cough and lung dryness. The Donguibogam records it as a root that, despite its cold nature, can still nourish the body — moistening the five viscera and clearing heat from a taxed lung. The text also preserves a practical quality test: only large roots with a sweet taste were considered good stock.

In the Donguibogam

東醫
寶鑑
性寒, 味苦甘, 無毒. 治肺氣喘嗽, 消痰, 止吐血. 療肺痿, 通腎氣, 鎭心, 利小便. 冷而能補, 殺三蟲, 悅顔色, 止消渴, 潤五藏.
Source: Donguibogam, Tangaek-pyeon (Herbology volume)
TranslationIts nature is cold, its taste bitter and sweet, and it is non-toxic. It treats lung-qi wheezing cough, resolves phlegm, and stops vomiting blood. It treats lung atrophy, unblocks kidney qi, calms the heart, and benefits urination. Though cold, it is still able to tonify; it kills the three kinds of parasites, brightens the complexion, stops wasting-thirst, and moistens the five viscera.

Traditional uses recorded in the Donguibogam

  • Tonifies lung and kidney yin
  • Resolves phlegm, stops cough
  • Moistens the five viscera
  • Calms the heart, benefits urination

Traditional applications recorded in the classical text

  • Dry, wheezing cough from lung heat
  • Wasting-thirst pattern
  • Dry constipation from fluid deficiency
  • General weakness after illness

Traditional preparation

Root harvested in the 2nd, 3rd, 7th, or 8th lunar month and sun-dried; before use, soaked in hot water, split open, and the central core removed. Large, sweet-tasting roots were considered the best quality.

This describes traditional preparation recorded in the classics, not a recommendation for use today. DonguiHub does not provide dosage guidance — consult a qualified professional before using any herb.

Cautions

Caution: A cold-natured tonic; the Donguibogam records no toxicity, but those with a cold, weak digestive constitution or loose stool should use it cautiously, as with other cooling yin tonics. Consult a professional.
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Frequently asked questions

How is asparagus root different from Liriope (maekmundong)?

Both are cooling yin tonics for the lung and are often paired, but the Donguibogam records asparagus root as colder in nature with a stronger action on kidney qi, while Liriope leans more toward the stomach and heart. They are frequently combined rather than substituted for each other.

How did the Donguibogam judge good-quality asparagus root?

By size and taste — the text specifically notes that large roots with a sweet flavor were considered the best stock, a practical quality marker still referenced by herb dealers.

Sources