Hoary Alyssum (Berteroa incana)

Hoary Alyssum

Berteroa incana

Fuzzy silver foliage glows in sun, a tough wildflower. Biennial or short-lived perennial; common name: Hoary Alyssum.

Full sun
1/week
Beginner
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Plant Needs

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Sunlight Prefers full sun to partial shade; tolerates dry, exposed growing conditions
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Watering Drought-tolerant; water only when top 5–7 cm of soil is completely dry to avoid root rot
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Temperature Extremely cold-hardy; tolerates hot, dry summer temperatures without significant stress
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Characteristics

  • Leaf: Narrow, linear to oblong leaves covered in fine white hairs, giving a silvery-gray appearance.
  • Flower: Clusters of small, four-petaled white flowers with a subtle sweet scent.
  • Stem: Erect, branched stems with dense hoary pubescence.
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Care Guide

Watering

Water sparingly during active growth; allow soil to fully dry between waterings

Fertilization

Optional diluted compost tea once monthly to support growth. No regular fertilization is required for established plants

Eggshell powder topdress:Sprinkle finely crushed, dried eggshells on the soil surface to add calcium without risk of over-fertilization; avoid burying shells to prevent odor
Pruning
  • Deadhead spent flower clusters to encourage extended blooming through early summer
  • Cut back stems to ground level after flowering to promote new basal growth
  • Remove damaged or yellowing foliage to maintain plant health and air circulation
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Non-toxic to cats per ASPCA guidelines

Humans: Ingestion may cause mild gastrointestinal upset in humans; skin contact is non-irritating

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental ground cover for wildflower gardens; avoid planting in pastures as it is toxic to horses