May Night salvia

Sun

Full sun; tolerates light shade, but flowers less and may lean.

Water

Water regularly during establishment. Once established, allow the soil surface to dry between waterings; plants tolerate short dry spells but flower better with occasional deep watering during prolonged drought.

Soil

Well-drained soil, from sandy to loamy or clay-based soil that does not stay wet. Average fertility is sufficient; avoid waterlogged ground, especially in winter.

Height

1.5-2.5 ft (0.45-0.75 m)

Spread

1-2 ft (0.3-0.6 m)

Flowers

Deep violet-blue flower spikes in late spring and early summer, with a smaller repeat display in summer or early autumn if cut back and watered.

Foliage

Wrinkled, lance-shaped, grey-green to green leaves with scalloped edges and an aromatic scent when rubbed; foliage usually dies back in winter.

Growth

Moderate; usually forms a substantial flowering clump within two growing seasons.

Care needed

Low

• Pollinators
• Deer resistant
• Drought tolerant
• Cold hardy
• Low allergen
• Fragrant

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Very tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1 ft (0.3 m)

2. After 1 year

   1.3 ft (0.4 m)

3. After 2 years

   1.6 ft (0.5 m)

4. After 3 years

   2 ft (0.6 m)

   full size

About 3 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Growth rate

Moderate

• Water deeply when newly planted, then reduce watering as roots establish.
• Use only a light spring dressing of compost; heavy feeding encourages soft, floppy growth.
• Keep mulch clear of the crown to reduce winter rot.
• Divide crowded clumps in spring every three to four years if flowering declines.
• Grow in full sun and avoid crowding; well-grown plants rarely need staking.

Pruning. After the first flush fades, cut spent flower stems back to healthy leafy growth and water if the soil is dry to encourage another flush. Cut dead stems down near ground level in late winter or early spring before new growth develops.

Late winter

Remove dead stems before new shoots lengthen.

Spring

Plant or divide clumps once the soil is workable, and water divisions thoroughly.

Mid-spring

Apply a light dressing of compost if the soil is poor, keeping it away from the crown.

Early summer

Cut back fading flower spikes to leafy growth after the main display.

Summer

Water deeply during prolonged dry weather to support repeat flowering.

Autumn

Clear fallen debris from around the crown and check that water drains freely.

• Repeat small groups along the front or middle of a sunny border to create a rhythm of violet-blue spires.
• Plant with roses to contrast their rounded flowers with narrow, upright spikes.
• Combine with ornamental grasses, yarrow and coneflowers in naturalistic perennial planting.
• Use beside sunny paths or in gravel gardens where the compact clumps give a clear edge without forming a hedge.

Garden styles it suits: Cottage garden, New perennial (prairie), Pollinator garden, Dry gravel garden, Blues and silvers and Low-maintenance.

Plant it with: Roses, Yarrow, Coneflowers, Catmint, Tickseed and Feather reed grass.

Wildlife: Flowers provide nectar and pollen for bees and attract butterflies. Deer and rabbits usually avoid the aromatic foliage, although no plant is completely browse-proof.

• Crown or root rot in persistently wet soil: improve drainage or move the plant to a raised position, and keep mulch off the crown.
• Powdery mildew in crowded planting: increase airflow, water at soil level and remove badly affected foliage.
• Slugs and snails eating young spring shoots: inspect new growth and use traps, hand-picking or labelled iron-phosphate bait where needed.
• Flopping stems or weak flowering in shade or rich soil: move to full sun and stop heavy feeding.

Not known to be toxic to cats, dogs, horses or people. No part is recognized as seriously poisonous, but this ornamental salvia is not a culinary sage; discourage pets and children from eating it, as chewing any garden plant can cause stomach upset.

• Caradonna salvia (Salvia nemorosa 'Caradonna')

  Has conspicuously dark purple, almost black flowering stems and a generally narrower, more upright outline; May Night has a broader clump and less strikingly dark stems.

• East Friesland salvia (Salvia nemorosa 'Ostfriesland')

  Usually has a shorter, more compact habit and flowers with a more purple cast. It can be difficult to distinguish reliably from May Night without a cultivar label.

• Common sage (Salvia officinalis)

  Forms a woody-based, often evergreen shrub with thicker, greyer leaves rather than a mainly herbaceous clump with dense, upright flower spikes.

'Mainacht' is German for 'May night', referring to its dark flowers and early flowering season; Salvia comes from the Latin salvare, meaning 'to heal'.

Propagation. Divide established clumps in spring or take basal cuttings from fresh spring growth. Seed-raised plants may differ from 'Mainacht', so use vegetative propagation to retain the cultivar.

Accepted botanical name

Salvia sylvestris

Sources: GBIF (CC BY 4.0). The care and design notes are LandscapeGPT's own.