perennial

Tuberous Jerusalem Sage

Phlomis tuberosa

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Perennial

Height

40 inches

Width

30 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9

Water

Low to moderate

Humidity

Average

Lifespan

Perennial

Native To

Europe to Central Asia

Toxicity

Non-toxic

The Story

Plant Bio

Phlomis tuberosa is a perennial herbaceous plant with upright, hairy stems and attractive whorled leaves. It produces clusters of yellow flowers that bloom in dense, hooded whorls, creating a striking architectural display. This species is notable for its tuberous root system, which provides excellent drought tolerance and makes it suitable for xeriscaping and low-maintenance gardens.

Uses & Benefits:

Tall, fuzzy flower spikes add a soft texture to sunny borders.

Drought-resistant, reducing water needs and maintenance.

Supports pollinators like bees and beneficial insects.

Marketplace

Where to Buy

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Planting

How to Grow

Tuck seeds into well-drained soil in early spring.
Water regularly until established, then reduce watering.
Provide full sun for optimal flowering.
Divide clumps every 3-4 years in early spring.
Prune after flowering to maintain shape and encourage new growth.
Apply a balanced fertilizer in spring for best results.

Pro Tip

Ensure excellent drainage to prevent root rot and promote healthy growth.

Keep It Thriving

Care Guide

Do

Water deeply during dry periods 🌱
Prune after flowering to keep shape
Feed with a balanced fertilizer annually

Don't

Avoid overwatering, especially in winter ❌
Don’t fertilize late in the season
Refrain from heavy pruning during dormancy

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Drought-tolerant border plantSunny rock garden accent

Companion Plants

Lavender Sedum Echinacea Russian sage

Multiply

Propagation Methods

Good to Know

Common Questions

Tuberous Jerusalem Sage questions

What zones can Tuberous Jerusalem Sage grow in?

Tuberous Jerusalem Sage is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Tuberous Jerusalem Sage deer resistant?

Yes — Tuberous Jerusalem Sage is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Tuberous Jerusalem Sage bloom?

Tuberous Jerusalem Sage typically blooms in late spring to summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Tuberous Jerusalem Sage need full sun?

Tuberous Jerusalem Sage does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Tuberous Jerusalem Sage drought tolerant?

Yes — once established (usually after the first full season), Tuberous Jerusalem Sage handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.