Wildlife, Animals, and Plants
VALUE AND USE
SPECIES: Cardaria draba | Heart-Podded Hoary Cress
WOOD PRODUCTS VALUE :
IMPORTANCE TO LIVESTOCK AND WILDLIFE :
Heart-podded hoary cress is generally considered unpalatable to
livestock. However, sheep eat plants in early growth stages, and cattle
ingest seedheads [18,25].
NUTRITIONAL VALUE :
Although heart-podded hoary cress contains glucosinolates and is
potentially mildly toxic , nutritional levels are adequate to meet
the requirements of most classes of livestock, especially in the early
growth stages. Foliage becomes coarse and bitter as it matures [18,25].
Mean nutrient composition of whole heart-podded hoary cress plants
collected at five dates from eight sites in eastern Oregon, 1988 is as
rosette bolting early bloom full bloom full seed
% dry weight (4-12) (4-24) (5-12) (6-10) (7-7)
dry matter 22.6 22.6 27.6 33.4 95.9
crude protein 28.8 29.5 20.3 11.3 7.9
ndf * 13.1 16.0 23.9 34.9 52.8
adf ** 12.0 13.4 21.6 28.8 41.8
cellulose 9.9 11.2 17.0 22.0 32.1
lignin 1.9 2.3 4.4 5.9 9.4
ether extract 1.6 1.5 1.9 2.2 2.4
in-vitro *** 77.3 74.7 69.8 64.9 49.1
* neutral detergent fiber
** acid detergent fiber
*** in-vitro organic matter digestibility
COVER VALUE :
VALUE FOR REHABILITATION OF DISTURBED SITES :
OTHER USES AND VALUES :
Heart-podded hoary cress seed may be used as a substitute for pepper
MANAGEMENT CONSIDERATIONS :
Heart-podded hoary cress is classified as a noxious weed in 24 states
and 4 provinces [22,36]. Control is difficult because of the perennial
root system, abundant seed production, and diverse habitat of the plant.
In the absence of a competitor, a single plant spread over an area 12
feet (3.6 m) in diameter in 1 year . Irrigation facilitates the
spread and establishment of heart-podded hoary cress by transporting
root material from neglected ditch banks .
Control Methods - Mechanical: Cultivation alone will control
heart-podded hoary cress when tillage begins at flowerbud time and is
repeated every 10 days throughout the growing season . In Manitoba
and Alberta, it takes 3 years of intensive tillage to kill the root
system of heart-podded hoary cress . Flooding can kill heart-podded
hoary cress. Seeds buried in moist compacted manure for 1 month lose
their viability . Early spring plowing and planting to a cereal
crop can control heart-podded hoary cress .
Biological: Dense stands of established perennial grasses provide some
resistance to invasion and spread of heart-podded hoary cress if grazing
is not excessive .
Chemical: Several herbicides can control heart-podded hoary cress.
They are most effective if applied during the early bud stage or late
fall rosette stage [16,19,32]. Spraying followed by spring mowing can
control up to 90 percent of heart-podded hoary cress . Dense stands
of grass, mowed only when necessary and treated with a selective
herbicide, are best for controlling heart-podded hoary cress. Refer to
publication  for information on effective herbicides and application
Heart-podded hoary cress has some forage value, but until research
better evaluates its toxicity, McInnis  recommends the following
cautionary measures when allowing livestock to graze infested
rangelands: provide supplemental iodine, graze mature and nonlactating
animals, and provide alternate grazing areas.
Related categories for Species: Cardaria draba
| Heart-Podded Hoary Cress