Roadside pennycress (Thlaspi alliaceum)

Roadside pennycress

Roadside pennycress is an Asian native that has spread into North America where it is often found by roadsides, explaining its common name. When it grows in large stands, it can be identified by its strong garlic-like aroma. It is often confused for its relative T. arvense, but has rounder fruit.

Scientific classification

Species

Roadside pennycress (Thlaspi alliaceum)

Mustards, capers, and allies

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Annual

Lifespan

Herb

Plant Type

Early spring, Late winter

Bloom Time

White

Flower Color

Semi-evergreen

Leaf type

20 - 35 ℃

Ideal Temperature

Images of Roadside pennycress

Distribution of Roadside pennycress

Distribution Map

Roadside pennycress is native to temperate regions, flourishing naturally in various habitats across the continent of Europe. Over time, roadside pennycress has been introduced and has established itself in additional temperate locales within the European continent, enhancing its range but still retaining a primarily Eurocentric distribution.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Roadsides, grassy shoulders, fields, waste ground, pastures

Care Guide for Roadside pennycress

Every week

Water

Full sun

Sunlight

20 - 35 ℃

Ideal Temperature

Water: Roadside pennycress flourishes in moderate humidity and requires consistent moisture without waterlogging. Weekly watering maintains optimal hydration. When grown outdoors, consider natural rainfall during the growing season to adjust the watering schedule appropriately.

Fertilize: For roadside pennycress, use a balanced nutrition fertilizer, applying it every 4 to 6 weeks during the growing season. Employ a teaspoon of granular or equivalent liquid fertilizer per plant. Avoid over-fertilization; apply less in dormant seasons to maintain health while promoting growth and flowering.

Pruning: Roadside pennycress features small white flowers and adapts well to roadsides. Selective pruning in early to late spring encourages healthy growth, controls size, enhances bloom, improves air circulation, and reduces disease risk, making roadside pennycress an attractive and manageable garden addition.

Propagation: Propagation of roadside pennycress from seeds is essential. Use a well-draining, light, and fertile soil mix. Lightly sow seeds on the surface, maintaining consistent moisture. A warm, airy spot promotes germination while minimizing mold. Transplant seedlings with true leaves carefully, reducing root disturbance.

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