Salvia patens 'Cambridge Blue' (gentian sage 'Cambridge Blue') — Clump-forming or bushy, upright

Overview

Salvia patens 'Cambridge Blue' is a clump-forming or bushy, upright perennial in the genus Salvia, part of the Lamiaceae family, with deciduous, semi-evergreen or evergreen; aromatic, often textured or felted foliage. Salvia patens 'Cambridge Blue' grows best in full sun, and tolerates light loam and sand or chalk soils and neutral to alkaline pH. Its UK hardiness is rated H3–H5 for shrubby kinds, H6–H7 for the hardy herbaceous species. Suggested uses include borders, containers and cut flowers. It is native to Central Mexico.

About

Salvia patens 'Cambridge Blue' is a perennial gentian sage that forms upright, clump-forming stems. The foliage is aromatic and often textured or felted, with plants ranging from deciduous to semi‑evergreen or evergreen. Flowering runs from June to September. It performs best in full sun on sharply drained, neutral to alkaline soils in a south- or west-facing, sheltered spot.

Wikipedia contributors, CC BY-SA 4.0 — Salvia patens

About the genus

Salvia is the largest genus of plants in the sage family Lamiaceae, with just under 1,000 species of shrubs, herbaceous perennials, and annuals. Within the Lamiaceae, Salvia is part of the tribe Mentheae within the subfamily Nepetoideae. One of several genera commonly referred to as sage, it includes two widely used herbs, Salvia officinalis and Salvia rosmarinus.

Wikipedia contributors, "Salvia", CC BY-SA 4.0 — Salvia

In the garden

A perennial native to central Mexico, Salvia patens 'Cambridge Blue' sits in the Lamiaceae and grows as an upright, clump-forming Salvia with aromatic, often textured foliage. It flowers from June to September, providing several months of bloom through the summer and into early autumn. Place it in full sun on a light loam, sandy or chalky soil with a neutral to alkaline pH and sharp drainage; winter wet is the most common cause of loss. A south- or west-facing position with some shelter from cold winds will suit the plant. In UK hardiness terms the genus covers a range: shrubby kinds fall around H3–H5 (borderline to hardy) while the hardy herbaceous species are H6–H7 (very hardy to fully hardy); the USDA range recorded is 5–10. It works well in mixed borders, in containers where drainage and shelter can be controlled, and as a source of cut flowers through the summer months. In heavier soils lift the level of drainage in the planting hole or use a raised bed or pot; the plant rewards a sunny, well-drained site with a reliable run of blooms from June to September.

Growing conditions

Best soil and position for Salvia

Sunlight: Full sun
Soil type: Light loam, sand or chalk
Soil pH: Neutral to alkaline
Soil moisture: Sharply drained; winter wet is the usual cause of loss
Aspect: South or west facing
Exposure: Sheltered
UK hardiness: H3–H5 for shrubby kinds, H6–H7 for the hardy herbaceous species

Plant details

Salvia patens 'Cambridge Blue' size, habit and characteristics

Plant type: Perennial
Habit: Clump-forming or bushy, upright
Foliage: Deciduous, semi-evergreen or evergreen; aromatic, often textured or felted
Suggested uses: Borders, containers, cut flowers
Native to: Central Mexico

Care notes

Pruning and caring for Salvia patens 'Cambridge Blue'

Cultivation: Drainage matters more than cold — most losses come from sitting wet through winter rather than from low temperature. Give the sunniest, sharpest-draining spot available, delay cutting back until spring so old growth shelters the crown, and take insurance cuttings of anything tender.
Pruning: Leave the top growth intact over winter, then cut back to a low framework of live buds in mid-spring once the frosts have passed. Deadhead through summer to extend flowering.
Propagation: Softwood and semi-ripe cuttings root very easily from spring to late summer, which is the standard insurance against winter losses. Divide hardy herbaceous kinds in spring.
Pest resistance: Aromatic foliage deters most pests; capsid bug and leafhopper occasionally cause spotting.
Disease resistance: Robust in dry conditions. Powdery mildew and root rot appear only where the soil stays wet.

Frequently asked questions

How do I grow Salvia patens 'Cambridge Blue'?

Drainage matters more than cold — most losses come from sitting wet through winter rather than from low temperature. Give the sunniest, sharpest-draining spot available, delay cutting back until spring so old growth shelters the crown, and take insurance cuttings of anything tender.

Where is the best place to plant Salvia patens 'Cambridge Blue'?

Salvia patens 'Cambridge Blue' prefers full sun. It suits sheltered positions.

What soil does Salvia patens 'Cambridge Blue' need?

Salvia patens 'Cambridge Blue' grows best in light loam and sand or chalk soil. It prefers neutral to alkaline soil. Aim for soil that stays sharply drained; winter wet is the usual cause of loss.

How do I prune Salvia patens 'Cambridge Blue'?

Leave the top growth intact over winter, then cut back to a low framework of live buds in mid-spring once the frosts have passed. Deadhead through summer to extend flowering.

Is Salvia patens 'Cambridge Blue' hardy in the UK?

Salvia patens 'Cambridge Blue' has an RHS hardiness rating of H3, meaning it is half-hardy, tolerating -5 to 1°C, and may need winter protection in colder areas.

How do I propagate Salvia patens 'Cambridge Blue'?

Softwood and semi-ripe cuttings root very easily from spring to late summer, which is the standard insurance against winter losses. Divide hardy herbaceous kinds in spring.

More in the Salvia genus

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