In short
- Site: full sun, free-draining, rather alkaline soil.
- Very drought-tolerant — does not tolerate wet, rich soil.
- Blooms from July to October in a cloud of blue flowers.
- The aromatic, silvery stems are disease-resistant and left alone by browsing animals.
- Cut back hard in early spring — it flowers on the current year's growth.
Botanical data
- Family
- Lamiaceae (Lamiaceae)
- Height
- 0.9–1.2 m
- Width
- 0.6–1 m
- Habit
- Upright
- Growth rate
- Fast
- Position
- Full sun
- Soil
- Sandy, Chalky, Loamy
- pH reaction
- pH 6.5–8
- Moisture
- Dry, Moderate
- Bloom
- July–October
- Hardiness
- USDA 4b–9a
- Propagation
- From cuttings
Characteristics
Forms a loose clump of upright, whitish-hairy stems 0.9–1.2 m tall that become slightly woody at the base. The grey-green, deeply cut leaves release a spicy, sage-like scent when crushed. The small, two-lipped flowers are borne in branched, panicle-like heads that wrap the plant in a blue haze.
Growing and care
Watering
Very drought-tolerant once established. Does not tolerate wet soil — winter dampness is more dangerous to it than frost.
Fertilizing
Very sparingly — on rich, moist soil the stems flop and the plant loses its compact shape.
Planting
A sunny, free-draining site; on heavy soils add gravel or coarse sand to the planting hole.
Pruning calendar
Pruning group: Summer-flowering shrubs (on new growth)
What and how to cut
In early spring, before growth starts, cut last year's shoots back low — above the second or third pair of healthy buds above the woody framework; remove weak and dead shoots.
In early spring, before growth resumes.
What not to do
Don't prune in autumn (fresh wounds suffer frost damage) or after the buds have set in midsummer.
Companion plants
Good companions
A classic gravel- and prairie-garden combination — both plants like sun and dry soil and flower side by side in autumn.
The tall grass provides a structural backdrop for the airy, blue stems of Russian sage in the prairie style.
A lower, also blue-flowering perennial with identical needs — it extends the band of blue right through the season.
Bad companions
The astilbe needs permanently moist, shady soil, in which Russian sage rots and flops — extremely divergent water needs.
The evidence level indicates whether the relationship is backed by research, observation, or gardening tradition.
Diseases and pests
Toxicity
| For whom | Level | Notes |
|---|---|---|
| Humans | None | — |
| Dogs | None | — |
| Cats | None | — |
History and origin
The genus Perovskia was named after the Russian general V. A. Perovsky. Long known as Perovskia atriplicifolia, the species was moved into the sage genus as Salvia yangii after the genetic revision of the mint family. In gardens it was popularised by cultivars such as Blue Spire.
Uses
For gravel and prairie gardens and dry borders, for slopes and urban plantings exposed to heat and drought. Its airy habit and late flowering make it a valuable partner for ornamental grasses and stonecrops.
Trivia
- Despite the common English name Russian sage, it is neither a true culinary sage nor a Russian plant — it comes from Central Asia.
- The silvery hairs and essential oils reduce water loss and deter herbivores, so Russian sage copes superbly with heat and is planted where wildlife eats other perennials.
Frequently asked questions
When and how should Russian sage be pruned?
In early spring, before growth resumes, cut the previous year's stems back low, to 15–20 cm above the ground. The plant flowers on the current year's growth, so hard pruning gives a compact habit and abundant bloom.
Why do Russian sage stems flop and splay apart?
Usually because of soil that is too rich, too much water, or a site that is too shady. In a sunny, lean and free-draining spot, after spring pruning, the plant grows compactly.
Is Russian sage hardy in our climate?
Yes, it is hardy to USDA zone 4–5. The key to overwintering, however, is a free-draining site — winter dampness in the soil harms it more than frost itself.
Sources
- Plants of the World Online (POWO)Database (GBIF, POWO…)
- RHS — Salvia yangii (Perovskia atriplicifolia)Institution / botanical garden
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