Sea Lavender 'Blue Diamond' (Limonium speciosum 'Blue Diamond')

Sea Lavender 'Blue Diamond'

Limonium speciosum 'Blue Diamond'

Dense clusters of vivid blue blooms hold color for months, a long-lasting cut flower. Herbaceous perennial; common name: Sea Lavender 'Blue Diamond'.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Requires full sun exposure for optimal blooming; tolerates partial shade but produces fewer flower clusters
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Watering Allow the top 2–3 cm of soil to dry between waterings; avoid waterlogging as roots are prone to rot
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Temperature Thrives in cool to warm temperatures; can tolerate light frosts down to 5°C without significant damage
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Characteristics

  • Leaf: Basal rosette of lanceolate, gray-green, slightly fuzzy leaves with smooth margins
  • Flower: Tiny, papery blue blossoms in dense, upright terminal clusters
  • Stem: Slender, branching, wiry stems that hold flower clusters upright
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Care Guide

Watering

Keep soil evenly moist during active growth; avoid overwatering to prevent root rot

Fertilization

Diluted balanced liquid feed every 4 weeks. Avoid over-fertilizing, as excessive nitrogen can reduce flower production

Banana peel compost tea:Soak fully composted banana peels in water for 24 hours, dilute 1:20 for root drench; discard solids to prevent pest infestations and odor
Pruning
  • Deadhead spent flower clusters regularly to encourage prolonged blooming into early autumn
  • Cut back the entire plant to the basal rosette after flowering to promote healthy new growth the following season
  • Remove yellowing basal leaves to maintain plant health and improve airflow around the rosette
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no adverse effects from ingestion or contact

Humans: No known toxicity to humans; safe for handling and proximity

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Garden Uses & Culture

Culture: Symbolizes remembrance and lasting beauty, often used in dried flower arrangements for long-term display

Usage: Ornamental garden plant; popular as a long-lasting cut and dried flower