Photo by Melody

PlantFiles: Hoary Cress
Cardaria draba

Family: Brassicaceae (brass-ih-KAY-see-ee) (Info)
Genus: Cardaria (kar-DAR-ee-uh) (Info)
Species: draba (DRAY-buh) (Info)

Synonym:Lepidium draba


6-12 in. (15-30 cm)
12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)

9-12 in. (22-30 cm)

USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Full Sun
Sun to Partial Shade

All parts of plant are poisonous if ingested

Bloom Color:
White/Near White

Bloom Time:
Mid Spring


Other details:
May be a noxious weed or invasive

Soil pH requirements:
Unknown - Tell us

Patent Information:

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

Click thumbnail
to view:

By kennedyh
Thumbnail #1 of Cardaria draba by kennedyh

By kennedyh
Thumbnail #2 of Cardaria draba by kennedyh

By kennedyh
Thumbnail #3 of Cardaria draba by kennedyh

By Zaragoza
Thumbnail #4 of Cardaria draba by Zaragoza


No positives
No neutrals
2 negatives

Gardeners' Notes:

Negative MaryE On Oct 8, 2009, MaryE from Baker City, OR (Zone 5b) wrote:

Common names for this plant are Hoary Cress, Pepperwort and Whitetop. It is very invasive and becoming more of a problem every year in my area of eastern Oregon where it grows along roadsides, in pastures, in hayfields, cultivated fields, and in everyone's gardens. My weed book (from Idaho) lists it as a noxious weed, and states that it first appeared in North America in the late 19th century along both the east and west seacoasts, apparently having traveled in ships ballast, which included soil as well as rocks. The origin appeared to be Europe.

It spreads by seeds and roots and is a very agressive plant.

Negative Joan On Apr 1, 2007, Joan from Belfield, ND (Zone 4a) wrote:

This plant is listed on the North Dakota invasive/troublesome list and this information is being distributed in a guide developed by the ND Weed Control Association and other agencies.

Plant Features
Perennial, up to 2.5 feet tall
Leaves clasp stem and are covered with hairs giving plant a grayish appearance
Each stem produces manyflowering branches; creates a white-top appearance
Flowers abundant, 1/4 inch wide, 4 petals
Blooms May through June
Spreads by seeds (July) and deep, creeping roots (rhizomatous)
Egg-shaped seeds
Creates monocultures

Documented in a few areas. Grows under most conditions

Interesting Facts
Member of the mustard family
Toxic to cattle if ingested, contains glucosinolates
First year's plant roots can grow up to 12 feet laterally and producd over four hundred shoots


This plant has been said to grow in the following regions:

Belfield, North Dakota
Baker City, Oregon

We recommend Firefox
Overwhelmed? There's a lot to see here. Try starting at our homepage.

[ Home | About | Advertise | Media Kit | Mission | Featured Companies | Submit an Article | Terms of Use | Tour | Rules | Privacy Policy | Contact Us ]

Back to the top

Copyright © 2000-2015 Dave's Garden, an Internet Brands company. All Rights Reserved.

Hope for America