Auriculate Buckler-Mustard (Biscutella auriculata)

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Sunlight Requires full sun for optimal flowering; tolerates partial afternoon shade in hot Mediterranean summers

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Watering Allow soil to dry completely between waterings; drought-tolerant once established

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Temperature Hardy to mild frost; thrives in cool to temperate growing conditions

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Leaf: Basal rosette of oblong to spoon-shaped leaves with ear-shaped (auriculate) bases; stem leaves smaller, clasping the stem.
Flower: Small four-petaled yellow blooms in loose racemes; petals obovate, 3–5 mm long.
Stem: Slender, branching stems covered in fine, soft pubescence.

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Watering

Keep soil slightly moist during active growth; avoid waterlogging

Fertilization

Light, diluted low-nitrogen feed once monthly. Avoid high-nitrogen fertilizers to prevent leggy growth

Crushed eggshell powder：Crush dried, clean eggshells into fine powder; sprinkle lightly on soil surface to boost calcium levels without burning roots

Pruning

Deadhead spent flower racemes to encourage prolonged blooming through spring
Trim back faded basal foliage in late autumn to tidy the planting area
Thin overcrowded clumps in early spring to improve airflow and reduce disease risk

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Warning: this plant may be toxic.

Pets & Humans

Pets: No known toxic effects to cats per ASPCA and horticultural records

Humans: No known toxic effects to humans with typical handling or ingestion

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Culture: N/A

Usage: Ornamental rock garden plant; provides nectar for native pollinators including bees and butterflies