PlantFun
Plant Needs
Sunlight
Full sun to partial shade; tolerates short dry shade periods and performs best with consistent sunlight for flowering
Watering
Water deeply when the top 2 cm of soil dries out; avoid overwatering to prevent root rot in heavy soils
Temperature
Hardy to -15°C; thrives in cool temperate conditions and avoids extreme summer heat above 28°C
Characteristics
- Leaf: Narrow linear to lanceolate gray-green leaves with fine, soft pubescence
- Flower: Dense terminal spikes of small, bright blue four-petaled blooms
- Stem: Slender upright branching stems with subtle hairy texture
Care Guide
Watering
Keep soil consistently moist but not waterlogged
Fertilization
Light diluted organic feed once monthly. Use a balanced, low-nitrogen feed to support bloom production rather than leafy growth
Eggshell powder topdressing：Crush dried eggshells into fine powder, sprinkle lightly on soil surface, and water in to release calcium gradually without causing soil pH imbalancesPruning
- Deadhead spent flower spikes promptly to encourage prolonged secondary blooming
- Cut back entire foliage to ground level after flowering to promote healthy new growth in the following season
- Thin overcrowded clumps in early spring to improve airflow and reduce disease risk
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Non-toxic to cats
Humans: No known toxicity to humans
Garden Uses & Culture
Culture: N/A
Usage: Ornamental for rock gardens, border edging, and pollinator-friendly wildflower plantings
