How to Grow Jerusalem Sage
iNaturalist
Jerusalem Sage
Phlomis fruticosa
shrubJerusalem Sage is a Mediterranean native shrub known for its soft, grey-green foliage and distinctive whorled clusters of bright yellow flowers that bloom throughout summer. This woody perennial is drought-tolerant, low-maintenance, and attracts pollinators while adding architectural interest to gardens.
When should you plant Jerusalem Sage in your zone?
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Example Jerusalem Sage timeline · Pittsburgh, PA (Zone 6b)
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Plant Jerusalem Sage
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Jerusalem Sage
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 8-11; tender in colder regions but can be grown in containers
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Get my Jerusalem Sage timeline →Growth Stages
Establishment
3-6 monthsYoung transplant with modest foliage growth and developing root system
Water regularly but allow soil to dry between waterings. Protect from harsh wind in first season. Do not fertilize heavily.
Vegetative Growth
Spring to early summerShrub develops woody stems and characteristic soft, downy grey-green leaves; compact mounding form emerges
Maintain moderate water; no fertilizer needed. Prune lightly to encourage bushiness and shape if desired.
Flowering
June through SeptemberDistinctive yellow flower whorls (verticillasters) appear along upper stems; flowers are tubular and attract bees and hummingbirds
Deadhead spent flowers to encourage continuous bloom. Reduce water slightly during peak heat.
Late Summer to Fall
August through OctoberFlowering continues; foliage may grey slightly as plant enters semi-dormancy; growth slows
Reduce watering as temperatures cool. Do not fertilize. Remove any dead or damaged wood.
Winter Dormancy
November through MarchPlant enters dormancy in colder zones; may retain foliage in warmer climates but growth halts
Minimal watering; no fertilizer. In zones 8-9, may experience frost damage—protect with row cover if temperatures drop below 0°F. Prune after last frost in spring.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; ensure adequate air circulation. Use neem oil if infestation is severe. More common in dry, warm climates.
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Yellow sticky traps; spray with insecticidal soap or neem oil. Prune heavily infested branches.
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Prevent via excellent drainage and reduced watering. Remove and destroy severely affected plants. Improve soil drainage with amended planting medium.
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Prune out infested branches. Spray with horticultural oil in late winter before growth resumes.
Uses
Pollinator Support
WildlifeThe bright yellow flowers are highly attractive to bees, hummingbirds, and butterflies, making it an excellent choice for pollinator gardens and xeriscaping with wildlife value. [source]
Drought-Tolerant Landscaping
HouseholdJerusalem Sage is ideal for water-wise, low-maintenance gardens in Mediterranean or xeriscape designs, reducing irrigation needs and maintenance labor. [source]
Dried Flower Arrangements
CraftThe dried flower spikes and silvery foliage add texture and visual interest to dried arrangements, wreaths, and long-lasting floral compositions. [source]
Ornamental Screening and Structure
HouseholdIts woody, mounding form and graceful branching make it useful as a semi-formal hedge, screen, or specimen plant for architectural gardens and Mediterranean landscapes. [source]
Traditional Herbal Use
MedicinalIn Mediterranean folk medicine, Jerusalem Sage leaves have been brewed into teas for anti-inflammatory and antimicrobial properties, though modern clinical use is limited. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Jerusalem Sage is an ornamental shrub, not typically harvested for food. Flower spikes and stems can be cut for dried arrangements or fresh bouquets mid-summer through early fall. Prune in early spring (after last frost) to remove winter-damaged wood and maintain compact form. Cut back by one-third to one-half of total height.
Fun Facts
- 🌱 Despite its common name, Jerusalem Sage is not actually a sage (Salvia genus) nor does it originate from Jerusalem; it is native to the Mediterranean, particularly the eastern Mediterranean region.
- 🌱 The plant's Latin genus name 'Phlomis' comes from the Greek word for flame, referencing the bright, flame-like yellow flowers that light up the garden.
- 🌱 Jerusalem Sage's soft, downy grey foliage is an adaptation to intense Mediterranean sun and drought; the fine hairs reflect sunlight and reduce water loss through transpiration, making it exceptionally drought-resistant once established.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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