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Charlock Mustard Sinapis arvensis 

 
 
Attracts BeesBees are attracted to this plant
Attracts ButterfliesButterflies are attracted to this plant
Attracts FliesFlies are attracted to this plant
Attracts BirdsBirds are attracted to this plant
Annual Life CycleAnnual life cycle
Cross-Shaped FlowersCross-shaped flowers
Yellow FlowersYellow flowers
4 Petals4 petals
May-Sep Flowering
period
Oval LeavesOval leaves
Toothed LeavesToothed leaves
Ribbed StemRibbed stem
Tap RootTap root
80cmMaximum height
 
 
  Main image of Charlock Mustard

© 2020-2025 Adrian Briggs

 

Charlock Mustard is a non-native annual plant of the UK, typically found growing in cropland, to a mature height of up to 80cm.

Charlock Mustard was introduced into the UK from the Mediterranean before the sixteenth century and is now found widely across the UK. Charlock Mustard is a branching plant with hairy stems and glossy leaves, with irregularly lobed or toothed edges.

Botanic classification and naming: Charlock Mustard is a member of the Cabbage (Brassicaceae) family. The genus name 'Sinapis' identifies the plant as a Mustard and its species name 'arvensis' means 'field plant'.

Concerns: Charlock has seeds that are poisonous to humans, horses and livestock, causing gastrointestinal upset. Charlock seed also remains dormant and viable for many decades, germinating when the ground is disturbed.

Benefits: Atrracts bee and fly pollinators and provides a food source for butterfly caterpillars, such as those of the Small White. Charlock seed is eaten by birds.

Benefits to wildlife are also indicated with orange icons in the plant profile bar at the top.

 

 
Flower of Charlock Mustard

© 2021 Adrian Briggs

 

Flowers:
Charlock Mustard usually flowers between May and September.

Flower colour:

Flower Colour Yellow

Yellow

Flower shape:

Flower Shape  Cross

Cross

Petals:

Petal Number =  4

4

Leaf of Charlock Mustard

© 2021 Adrian Briggs

 

Leaves:

Leaf Shape:

Leaf Shape is Oval

Oval

Or:

Alternative Leaf Shape is Elongated

Elongated

Leaf Margins:

Leaf Margin is toothed

toothed

Stem of Charlock Mustard

© 2021 Adrian Briggs

 

Stem and Roots:

Stem shape:

Stem Shape is Ribbed

Ribbed

Root type:

Root Type is Tap

Tap