PlantFun
Plant Needs
Sunlight
Full sun to partial shade; tolerates intense Mediterranean summer sun but benefits from light shade in extreme heat
Watering
Allow soil to dry completely between waterings; drought-tolerant once established, avoid waterlogging
Temperature
Hardy to 5°C; protect from frost and prolonged temperatures above 38°C
Characteristics
- Leaf: Narrow, linear to lanceolate gray-green leaves, arranged in whorls along erect stems
- Flower: Flat-topped clusters of chartreuse bracts surrounding tiny true flowers
- Stem: Green to reddish-brown erect stems with milky, irritant sap when broken
Care Guide
Watering
Water deeply once soil is fully dry; reduce watering during extended rainy periods
Fertilization
Diluted balanced liquid feed once at the start of growth. Over-fertilization can cause leggy growth and reduced flowering
Eggshell powder topdressing：Crush fully dried eggshells into fine powder; sprinkle a thin layer on soil surface, avoiding direct root contact to prevent irritationPruning
- Remove spent flower heads after blooming to maintain tidy growth and reduce self-seeding
- Trim back leggy stems in late winter to promote compact, bushy growth
- Remove damaged or diseased foliage to improve air circulation and prevent pest infestations
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Toxic; ingestion causes vomiting, diarrhea, oral pain, and drooling
Humans: Milky sap causes skin and eye irritation; ingestion leads to mild gastrointestinal upset
Garden Uses & Culture
Culture: Symbolizes resilience and drought tolerance in xeric gardening
Usage: Xeriscaping, garden border planting, ornamental groundcover for sunny slopes
