Guillon's Biscutella (Biscutella guillonii)

Guillon's Biscutella

Biscutella guillonii

Its sunlit discs catch light like golden coins in a meadow. Mediterranean annual herb, member of mustard family.

Full sun
1/week
Beginner
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Plant Needs

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Sunlight Prefers full sun
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Watering Low water needs; tolerates dry soils
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Temperature Thrives in mild Mediterranean climates
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Characteristics

  • Leaves: Basal rosette leaves oblong to lanceolate, entire or slightly toothed; stem leaves smaller, clasping;
  • Flowers: Bright yellow, 4 petals in cruciform arrangement, borne on racemes;
  • Fruit: Flattened, circular silicles with central notch, winged margins;
  • Stem: Erect, slender, sometimes slightly hairy.
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Care Guide

Watering

Moderate watering if drought persists

Fertilization

Light organic matter incorporation. Light feeding in spring to support flowering

Banana peel compost:Dry and chop banana peels; mix into soil around base to boost blooms
Pruning
  • Remove spent flower stems to encourage prolonged blooming;
  • Thin overcrowded basal rosettes in early growth;
  • Cut back after seed set if not collecting seeds.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Not listed as toxic (per ASPCA)

Humans: No known toxicity; edible parts limited to young leaves in small quantities

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Garden Uses & Culture

Culture: N/A

Usage: - **Ornamental**: Adds cheerful yellow to spring meadows; - **Ecological**: Supports pollinators with early-season nectar.