Salvia × sylvestris 'Mainacht' ('May Night') (May Night Sage) — Clump-forming or bushy, upright

Overview

Salvia × sylvestris 'Mainacht' ('May Night') 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 × sylvestris 'Mainacht' ('May Night') 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, rock gardens, containers and pollinator gardens.

About

Salvia × sylvestris 'Mainacht' ('May Night') is a clump-forming, upright perennial in the sage family valued for its aromatic, textured foliage and a long flowering span. It blooms from June to September and grows best in full sun on sharply drained soils. Give it a south- or west-facing, sheltered spot in light loam, sand or chalk with neutral to alkaline pH. Winter wet is the usual cause of loss.

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 member of the genus Salvia in the family Lamiaceae, Salvia × sylvestris 'Mainacht' ('May Night') is a perennial that forms steady clumps with aromatic, often textured leaves. Flowering runs from June to September, providing a reliable summer display while the foliage adds scent and texture when not in bloom. Plant it in full sun on sharply drained soils such as light loam, sand or chalk and avoid heavy, waterlogged ground; winter wet is the usual cause of loss. A south- or west-facing, sheltered aspect suits it best. As a hardy herbaceous salvia it corresponds to H6–H7 in UK terms (very hardy to fully hardy) and also fits USDA zones 5–10, so it tolerates a wide range of temperate conditions when drainage and exposure are right. Use May Night Sage in mixed borders, rock gardens, containers and pollinator beds where its long flowering period benefits bees and other insects. The aromatic foliage gives interest outside the flowering months and is worth inspecting for its textured, mildly scented leaves.

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 × sylvestris 'Mainacht' ('May Night') 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, rock gardens, containers, pollinator gardens
Fragrance: Aromatic foliage with a mild scent

Care notes

Pruning and caring for Salvia × sylvestris 'Mainacht' ('May Night')

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 × sylvestris 'Mainacht' ('May Night')?

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 × sylvestris 'Mainacht' ('May Night')?

Salvia × sylvestris 'Mainacht' ('May Night') prefers full sun. It suits sheltered positions.

What soil does Salvia × sylvestris 'Mainacht' ('May Night') need?

Salvia × sylvestris 'Mainacht' ('May Night') 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 × sylvestris 'Mainacht' ('May Night')?

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 × sylvestris 'Mainacht' ('May Night') hardy in the UK?

Salvia × sylvestris 'Mainacht' ('May Night') 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 × sylvestris 'Mainacht' ('May Night')?

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

Browse all Salvia →