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Cardaria draba - (L.)Desv.

Common Name Hoary Cress, Whitetop
Family Brassicaceae or Cruciferae
USDA hardiness 5-9
Known Hazards Raw plant material can be harsh, spicy, and irritating. Cooking is essential for neutralizing potentially harmful glucosinolates. Although livestock toxicity is documented, properly cooked human portions are considered safe. Avoid harvesting from contaminated roadsides or areas treated with herbicides, as hoarycress is frequently targeted for control.
Habitats A weed of arable fields, it is spreading rapidly in Britain[17].Native to Eurasia, heartpod hoarycress is now abundant throughout western and central North America. It occurs from lowland valleys to mid-elevation foothills and spreads aggressively along disturbed corridors. In the Southwest, it is common in Colorado, Utah, Nevada, Arizona, and New Mexico, extending northward across the Rockies and westward into California and the Great Basin. Its spread is rapid and ecologically disruptive, often dominating entire fields.
Range Europe - Mediterranean to W. Asia. Naturalized in Britain[17].
Edibility Rating    (3 of 5)
Other Uses    (1 of 5)
Weed Potential Yes
Medicinal Rating    (1 of 5)
Care (info)
Fully Hardy Moist Soil Semi-shade Full sun
Cardaria draba Hoary Cress, Whitetop


http://commons.wikimedia.org/wiki/User:Luis_Fernández_García
Cardaria draba Hoary Cress, Whitetop
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Summary

Heartpod hoarycress—commonly called whitetop—is a highly invasive Eurasian mustard that has become widespread across western North America. Despite its poor reputation in agriculture and rangeland management, it is a genuinely valuable edible resource. The leaves, flowers, and seeds are all edible when properly cooked, offering a spicy mustard-derived flavour typical of many Brassicaceae plants. Because the species forms massive monocultures, foragers who learn to identify it gain access to an abundant, renewable, and seasonally reliable food source. Its distinctive white “snowdrift” flower clusters, heart-shaped pods, and gray-green felted foliage make identification straightforward. Although mildly toxic to livestock when consumed heavily, cooked plant parts are acceptable for human use. Foragers must, however, harvest responsibly and avoid contributing to the plant’s spread.


Physical Characteristics

 icon of manicon of flower
Cardaria draba is a PERENNIAL growing to 0.5 m (1ft 8in).
See above for USDA hardiness. It is hardy to UK zone 6. It is in flower from May to June. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees, insects. The plant is self-fertile.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.

UK Hardiness Map US Hardiness Map

Synonyms

Lepidium draba.

Plant Habitats

 Cultivated Beds;

Edible Uses

Edible Parts: Leaves  Shoots
Edible Uses: Condiment

Young leaves and shoots - raw in salads or cooked as a potherb[2, 61, 105, 183]. A report says that the young leaves contain the toxin hydrogen cyanide, though does not give any more details[240]. In small quantities this substance is fairly harmless, and has even been recommended as having health benefits, but caution is suggested if you eat these leaves[K]. The pungent leaves are used as a seasoning[183]. The seed is used as a condiment, it is a pepper substitute[2, 17, 61, 74, 148, 183]. Edible Uses & Rating: The leaves, flowers, and seeds are edible cooked. Raw flavours are intensely spicy, mustardy, and sharp—far too aggressive for salads—while the hoary texture of the leaves is off-putting. Cooking dramatically improves all edible parts, softening fibres, neutralizing bitterness, and reducing glucosinolate pungency. Flowers are somewhat milder and can be used similarly to broccoli florets when briefly cooked, although their flavour is nowhere near as refined. Seeds are spicy and benefit from toasting or boiling to improve palatability. Due to the plant’s abundance and reliability, it rates highly as a survival or bulk-foraging species, even though its culinary quality is moderate [2-3]. Edibility rating: 3/5 for flavour; 5/5 for abundance. Taste, Processing & Kitchen Notes: Fresh leaves taste spicy, acrid, and cabbage-like with a strong “wild mustard” intensity. Felt-like hairs may create a dry, hoary mouthfeel, but these soften with heat. Boiled leaves become mild and palatable. Fresh flowers are slightly sweet due to nectar traces and are the mildest raw component. Unopened flower clusters resemble miniature broccoli and can be cooked similarly—steamed, boiled, or incorporated into mixed greens. Seeds are hot and mustard-like; roasting brings out nutty notes and reduces harshness. Because hoarycress often grows in disturbed or agricultural soils, thorough washing is essential. Cooking is strongly recommended regardless of part used. Seasonality (Phenology): Rosettes emerge in early spring, and flowering begins from May through August depending on climate and elevation. Flower clusters remain showy for weeks, followed by rapid seedpod maturation. Seeds persist into summer, though they drop easily when tapped, facilitating both harvest and natural spread. Leaves become tougher and less palatable as plants mature, so the ideal harvest window is spring through early summer [2-3]. Safety & Cautions (Food Use): Raw plant material can be harsh, spicy, and irritating. Cooking is essential for neutralizing potentially harmful glucosinolates. Although livestock toxicity is documented, properly cooked human portions are considered safe. Avoid harvesting from contaminated roadsides or areas treated with herbicides, as hoarycress is frequently targeted for control. Look-Alikes & Confusion Risks: Heartpod hoarycress resembles other Cardaria species, but those produce round instead of heart-shaped pods and may have hairy sepals. It may also be confused with some Lepidium species, but Lepidium pods are more strongly flattened and split open at maturity. The combination of clasping upper leaves, white flower masses, heart-shaped pods, and pubescent foliage makes C. draba distinguishable once known. Traditional / Indigenous Use Summary: Though not native to North America, heartpod hoarycress was quickly adopted by Indigenous groups after introduction, mainly for its edible cooked seeds and greens. Its Eurasian history as a minor food plant suggests long-standing recognition of its edibility despite its invasive or weedy nature. Harvest & Processing Workflow: Harvest young leaves in early spring by pulling or clipping the tender upper foliage. Wash thoroughly. Boil or steam to reduce heat and bitterness. Flower clusters can be harvested before opening or when freshly opened, then lightly steamed or sautéed. Seeds can be collected by tapping mature pods into a container; dry and winnow before toasting or grinding. Prevent spread by disposing of unwanted plant parts responsibly and avoiding disturbance that could break and spread rhizomes.

References   More on Edible Uses

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Antiscorbutic  Carminative

The plant is antiscorbutic[240]. The seeds have been used as a cure for flatulence and fish poison[240]. It is assumed that this report is referring to food poisoning caused by eating suspect fish[K].

References   More on Medicinal Uses

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Other Uses

Ecology & Wildlife: Flowers are highly attractive to insect pollinators, especially small bees, syrphid flies, and other generalist foraging insects. Rhizomatous mats can exclude native forbs and grasses, reducing biodiversity and altering soil dynamics. Seeds are not a major wildlife food source but may be eaten opportunistically by small birds or rodents. As with many mustard-family plants, the glucosinolate chemistry provides some herbivory resistance.

Special Uses

References   More on Other Uses

Cultivation details

Growing Conditions: Heartpod hoarycress thrives in disturbed soils, rangelands, roadsides, agricultural fields, open pastures, canal banks, and overgrazed lands. It tolerates both clay and sandy soils and is remarkably drought-resistant once established due to its deep and extensive rhizome system. Full sun promotes dense flowering, though plants tolerate partial shade. It is a hardy perennial, typically suited to USDA Hardiness Zones 3–9. Moisture increases biomass, but dryness does not deter survival. Habitat & Range: Native to Eurasia, heartpod hoarycress is now abundant throughout western and central North America. It occurs from lowland valleys to mid-elevation foothills and spreads aggressively along disturbed corridors. In the Southwest, it is common in Colorado, Utah, Nevada, Arizona, and New Mexico, extending northward across the Rockies and westward into California and the Great Basin. Its spread is rapid and ecologically disruptive, often dominating entire fields. Size & Landscape Performance Plants typically grow 15–50 cm tall, depending on soil fertility and moisture. Colonies may cover entire patches of ground, forming near-monocultures. Its extensive rhizomes enable it to re-sprout after cutting, grazing, or shallow tilling, making it tenacious but also reliable for harvest. Cultivation (Horticulture): Cultivation is strongly discouraged due to its invasive nature. However, to understand its growth: it thrives with minimal care, spreads vigorously by rhizomes and seeds, and survives drought, frost, and heavy disturbance. If managed intentionally, it would require strict containment. Because edible parts are abundant in the wild, cultivation is unnecessary. Identification & Habit: Heartpod hoarycress is a perennial mustard forming dense colonies through an extensive rhizome network. Plants range from 15–50 cm tall, producing upright stems clothed in alternating, grayish, pubescent leaves that lend the plant a hoary or weathered appearance. Lower leaves are oblanceolate to elliptic with obscure teeth, while upper leaves clasp the stems—one of its most distinctive vegetative traits. Inflorescences are dense racemes of small, snow-white, four-petalled flowers that collectively resemble masses of white foam or low, drifting clouds. Mature plants produce plump, hairless, heart-shaped pods—another key diagnostic feature. Overall, the habit is colonial, upright, and visually conspicuous during bloom.

References   Carbon Farming Information and Carbon Sequestration Information

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Plant Propagation

Seed - sow in situ in spring. There is very little need to encourage this plant, it is a rapidly spreading weed in Britain. Division in spring.

Other Names

If available other names are mentioned here

Hoary cress, Srdasica, White weed, globed-podded hoarycress, Peppergrass, whitetop, whiteweed, Heartpod Hoarycress, Heartpod Whitetop. Lepidium draba

Native Range

TEMPERATE ASIA: Cyprus, Egypt (Sinai), Iraq, Israel, Jordan, Lebanon, Syria, Turkey, Russian Federation-Ciscaucasia (Ciscaucasia), Armenia, Azerbaijan, Georgia, Russian Federation (Dagestan), Russian Federation (Altay, Irkutsk, Kurganskaja oblast, Omsk), Kazakhstan, Turkmenistan, Uzbekistan, China (Liaoning Sheng, Shandong Sheng, Xinjiang Uygur Zizhiqu) TROPICAL ASIA: Pakistan EUROPE: Austria, Russian Federation (European part), Moldova, Ukraine (incl. Krym), Albania, Bulgaria, Bosnia and Herzegovina, Greece (incl. Crete), Croatia, Italy (incl. Sardinia, Sicily), North Macedonia, Montenegro, Romania, Serbia, Slovenia, Spain (incl. Baleares), France (incl. Corsica) AFRICA: Egypt

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it's worth checking.

Noxious Weed Information. In the US it is a noxious weed in the following areas: Alaska (whitetop) Noxious weed. Arizona (globe-podded hoary cress) Prohibited noxious weed. (globe-podded hoary cress, whitetop) Restricted noxious weed. California (lens podded hoarycress) B list (noxious weeds). Colorado (hoary cress) B list (noxious weeds). Idaho (hoary cress) Noxious weed. Iowa (perennial pepper-grass) Primary noxious weed. Kansas (hoary cress) Noxious weed. Montana (whitetop, hoary cress) Category 1 noxious weed. Nevada (whitetop, hoary cress) Noxious weed. New Mexico (hoary cress) Class A noxious weed. Oregon (whitetop, hoary cress) "B" designated weed (whitetop, hoary cress) Quarantine. South Dakota (hoary cress) Noxious weed (hoary cress) Regulated non-native plant species. Utah (hoary cress) Noxious weed. Washington (hoary cress) Class C noxious weed. Wyoming (hoary cress, whitetop) Noxious weed. A weed in much of south-east and south-west Australia

Conservation Status

IUCN Red List of Threatened Plants Status : This taxon has not yet been assessed.

Related Plants
Latin NameCommon NameHabitHeightHardinessGrowthSoilShadeMoistureEdibleMedicinalOther

Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.

 

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Expert comment

Author

(L.)Desv.

Botanical References

17

Links / References

For a list of references used on this page please go here

Readers comment

annonymous   Sun Apr 16 2006

I am writing a paper on Cardaria draba and I have to include any useful features of the weed. So far I couldnt find any so Thank you o much for posting that sort of info about C. draba annonymous

Carey   Sun Apr 9 2006

how did cardaria draba get to the united states? what problems is it causing and how does cardaria draba differ from lepidium draba

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