False London-rocket (Sisymbrium loeselii)

False London-rocket

Sisymbrium loeselii

Its delicate yellow blooms support pollinators, a quiet workhorse of wild gardens. Annual herbaceous flowering plant; common name: False London-rocket.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates dry, nutrient-poor disturbed soils
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Watering Water deeply when the top 2 cm of soil is dry; drought-tolerant once established
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Temperature Hardy to -10°C; thrives in cool to temperate growing conditions
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Characteristics

  • Leaf: Basal leaves are pinnately lobed with toothed margins; upper stem leaves are smaller, linear to lanceolate
  • Flower: Tiny four-petaled pale yellow blooms arranged in terminal racemes
  • Stem: Erect, branched, sparsely hairy to glabrous
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Care Guide

Watering

Keep soil moderately moist during active growth; avoid waterlogging

Fertilization

Diluted balanced liquid feed once every 2 weeks. Avoid over-fertilization to prevent leggy growth

Banana peel tea:Chop banana peels and soak in water for 3 days; dilute 1:10 with water for root drench to support flowering
Pruning
  • Deadhead spent flower racemes to prevent unwanted self-seeding
  • Remove yellowing or damaged foliage to maintain plant health
  • Thin overcrowded stems to improve airflow and reduce disease risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: No documented toxicity to cats (ASPCA unlisted)

Humans: No documented toxicity to humans; young leaves are edible in small quantities

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Garden Uses & Culture

Culture: N/A

Usage: Pollinator-friendly wildflower; young leaves can be eaten raw or cooked in small quantities