How to Grow Phlomis
Phlomis fruticosa
Phlomis are drought-tolerant Mediterranean perennials that need full sun and very well-drained soil. They thrive in poor, gravelly conditions and hate winter wet, which is the main cause of failure in UK gardens. Leave the attractive seedheads for winter structure and cut back old growth in spring as new shoots appear. Rarely need feeding or watering once established. Excellent structural plants for gravel gardens and sunny borders.
Yearly Lifecycle
Care Essentials
Apply a light balanced feed in spring only if growth seems weak. Phlomis thrive in poor, lean soil — routine feeding is not needed and will produce soft, floppy growth prone to rot.
Watch For
- Root rot in wet or heavy soil — the main cause of failure
- Honey fungus in established plantings
- Leafhoppers causing pale leaf stippling
- Slugs and snails on young plants
Track your Phlomis care schedule — pruning, feeding, and seasonal tasks
Start planning freeCare Requirements
☀️ Light
Full sun essential; Mediterranean origin
Full sun is essential. Phlomis are Mediterranean plants that need maximum light and warmth. They become leggy and weak in shade.
💧 Watering
Very drought-tolerant; avoid overwatering
Very drought-tolerant once established. Water only during prolonged dry spells. Overwatering and winter wet are the main killers.
🌱 Fertilizing
Rarely needed; prefers poor, well-drained soil
Rarely needed. Phlomis thrive in poor, well-drained soil. Rich soil produces soft growth that is less hardy and more prone to rot.
✂️ Pruning
Leave seedheads; cut back in spring
Leave attractive seedheads for winter structure. Cut back old growth in spring as new shoots appear. Remove dead or frost-damaged stems.
Growing Tips
Drainage over everything
Plant in very well-drained soil; add grit to heavy clay. Winter wet kills phlomis faster than cold.
Winter seedheads
Leave the tiered seedheads standing through winter for architectural interest; cut back in spring.
Keep it lean
Avoid feeding and rich soil; lean conditions produce compact, hardy plants with better winter survival.
Pests & Diseases
Pest Leafhoppers
Identification: Pale stippling on upper leaf surfaces. Tiny pale insects jump away when disturbed. White cast skins on leaf undersides.
- Tolerate minor damage — phlomis usually outgrows it
- Encourage natural predators such as spiders and parasitic wasps
- Rarely warranted; spray with a pyrethrin-based insecticide only if severe
Pest Slugs and Snails
Identification: Irregular holes in young leaves and soft new growth. Slime trails around the base.
- Apply organic slug pellets (ferric phosphate) around young plants
- Use grit mulch which also improves drainage
- Encourage hedgehogs and ground beetles
- Ferric phosphate pellets (approved for organic use)
Disease Root Rot Phytophthora spp.
Symptoms: Wilting and yellowing foliage despite moist soil. Soft, dark roots. Plant collapses and dies.
Treatment: Lift and discard affected plants. Improve drainage before replanting.
Prevention: Plant in very well-drained soil. Add grit to heavy clay. Avoid winter waterlogging.
Disease Honey Fungus Armillaria mellea
Symptoms: Sudden wilting and death. White fungal sheets under bark at the base. Honey-coloured toadstools nearby in autumn.
Treatment: Dig up and destroy affected plants including all roots. Replace soil before replanting.
Prevention: Maintain plant vigour. No chemical prevention available. Physical root barriers can slow spread.
Log Phlomis in your garden — track growth, care, and harvests year after year
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