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Thlaspi arvense, known by the common name field pennycress, is a flowering plant in the cabbage family Brassicaceae.

Description
Thlaspi arvense L. - Pennycress. Other common English names are: stinkweed, bastard cress, fanweed,field pennycress, frenchweed, mithridatemustard and wildgarlic. It belongs to the mustard family (Brassicaceae). Pennycress is an anual, overwintering herb with an unpleasent odor when its leaves get squeezed. It grows up to 40 to 80 cm depending on eviromental conditions. White, lavender or pink flowers with four petals develop between five and eight seeds per plant. Numbers of Chromosomes is 2x. Pennycress, has flat and circular notched pods and is a common weed throughout much of North America and Euraisia where it has originated from. Its seeds have a high oil content and the species has gained interest as a potential feedstock for biofuel production.

Morphology and distribution
Pennycress is planted and emerges in the fall. Then it overwinters as a small rosette. The central stem and upper side stems terminate in erect racemes of small white flowers. Flowers are self-pollinated and produce a penny sized, heart-shaped, flat seed pod with up to 14 seeds. Each dark brown seed is oval-shaped and slightly larger than a camelina seed (Camelina sativa). Pennycress grows as a winter annual across much of the Midwestern US and the world. In population collections of wild Pennycress, it was found in the northern parts of the United States. Pennycress habitats include: cropland, fallow fields, areas along roadsides and railroads, gardens plots, weedy meadows, and waste areas. This plant prefers disturbed areas, and its capacity to invade higher quality natural habitats is low.

Climate requirements
Pennycress grows well in many different climates. It can produce seeds in the northern hemisphere during the winter season. In the US and the Mediterranean its sown commonly in October and can be harvested in May/June. To reach its yield potential a precipitation of about 300mm is needed. Pennycress has a rather low water use efficiency needing 405 liters of water to produce 0,45kg of seeds. Limited water availability depresses the yield. In general, pennycress is not well adapted for arid environments where natural precipitation is the only source of moisture.

Seeding
Current studies suggest a seeding rate of 1500 seeds per hectare for Europe while 672 seeds per hectare is suggested for the US. This variability is due to different climates. The recommended seeding depth is around 1 cm. For good germination rates pennycress needs about 25-40mm of water and favours cold and wet conditions.

Fertilization
In order to increase yields several studies evaluated the effect of fertilization on pennycress. Generally cover crops like Pennycress are meant to take up the available nutrients to prevent them from leaching. Nitrate and sulphur fertilization had positive effects on the seed yield of pennycress, but also no fertilized treatments showed sufficient yields. Harvesting yield Pennycress can be harvested with common machinery used for grain/corn and soy bean production. This makes it favorable for integration in many crop rotations. As pennycress is grown over the winter period the combines for harvesting are available in spring time as the harvest of all other crops happens at a different time of the year. The seed yield ranges from 500 kg/ha to 2400 kg/ha while most studies suggest an average yield of 1100 kg/ha.

Integration in soy maize crop rotations
In the mid east of the US a common crop rotation is Soybean and Maize. After harvest the fields are kept as fallows. Pennycress appears to be especially well suited for oil production when cultivated before soybean. As a cover crop grown over the winter period with harvest taking place in spring, it can effectively reduce soil erosion, prevent nutrient leaching, improve soil structure and increase biodiversity. ; ; The required machinery for cultivation is already available in the region, as it is the same used for maize and soybean production.

Ecology
A study in Germany indicates that a pennycress-corn double-cropping system improves spider diversity to a larger degree than mustard-corn, green fallow-corn and bare fallow-corn double cropping systems. The addition of pennycress to a corn rotation also increased and stabilized ground beetle diversity more effectively than a mustard (Sinapis alba)–corn rotation, a green fallow–corn rotation, or a bare fallow–corn rotation. This was mainly due to the evenness of plant cover throughout the growing season. Therefore, Bioenergy from double-cropped pennycress may support ground beetle diversity.

Pennycress can be utilized as part of a comprehensive integrated weed management strategy. Fall establishment can provide early spring ground cover and suppress aggressive spring germinating weeds such as common lambsquarters (Chenopodium album), giant ragweed (Ambrosia trifida), and tall waterhemp (Amaranthus tuberculatus). Johnson et al. (2015) speculated that weed suppression may have been caused by allelopathic compounds rather than ground cover when pennycress seeding rates and companion crops were taken into account.

Oil
The first attempts to grow pennycress as an oil crop took place in 1994. However, since 2002 its more and more considered as a potential oil crop rather than a “noxious weed”. High erucic acid content (>300g per kg of its total seed oil DM) makes the oil unsuitable for food purposes. Pennycress also contains Glucosinolates, which make the usage as food undesirable. Recently pennycress oil has attracted great interest as raw material for jet fuel and Biodiesel production. Oils with high eruic aicid are especially suitable for jet fuel production. Oil characteristics are highly influenced by specific environmental conditions such as percepetation.

Feed/Food
Due to the high eruric acid content the seeds are unsuitable for human consumption. Instead, the biomass can be used as feed for livestock. Its fast growth under cold conditions favors the usage as fodder as a second crop. Its low biomass production makes it undesirable to concentrate on pennycress cultivation for fodder production.