Halcyon hosta

Sun

Partial to full shade; gentle morning sun is suitable where soil stays moist. Avoid hot afternoon sun.

Water

Keep evenly moist but not waterlogged. Water deeply during dry spells, especially in the first growing season and in containers.

Soil

Humus-rich, moisture-retentive soil with good drainage; tolerates mildly acidic to mildly alkaline conditions.

Height

1-1.5 ft (0.3-0.45 m) in leaf; flower stems reach about 2 ft (0.6 m)

Spread

2-3 ft (0.6-0.9 m)

Flowers

Pale lavender, bell-shaped flowers on upright stems in mid- to late summer.

Foliage

Thick, pointed, heart-shaped leaves with pronounced veins and a waxy blue-grey coating; leaves become greener as the coating wears away.

Growth

Slow to moderate; takes several years to form a substantial clump.

Care needed

Low

• Pollinators
• Cold hardy
• Low allergen

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

Difficulty

Easy

Toughness

Fairly tough

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

1. Planting day

   1 ft (0.3 m)

2. After 1 year

   1 ft (0.32 m)

3. After 2 years

   1.1 ft (0.34 m)

4. After 3 years

   1.2 ft (0.36 m)

5. After 5 years

   1.2 ft (0.38 m)

   full size

About 4 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

Toxic

Growth rate

Slow

• Water at soil level during dry weather; do not let newly planted roots dry out.
• Apply compost or leaf mould in spring, keeping it clear of the crown.
• Feed lightly in spring if growth is weak; feed container plants with a balanced fertiliser according to its label.
• Avoid rubbing or repeatedly spraying the leaves, which can damage their blue waxy coating.
• Divide only when you want more plants or the clump becomes crowded; frequent division slows establishment.

Pruning. Cut spent flower stems back to the base unless you want seed. Remove collapsed leaves after they die back in autumn, or clear them before new shoots emerge in spring.

Early spring

Clear old foliage and check emerging shoots for slugs and snails.

Spring

Plant or divide clumps as growth begins, then water thoroughly.

Mid-spring

Mulch with compost or leaf mould, leaving the crown uncovered.

Summer

Water deeply during dry spells and watch container plants closely for drying.

Late summer

Remove faded flower stems if seed is not wanted.

Late autumn

Remove dead foliage and dispose of any leaves showing unusual mottling or distortion.

• Plant in repeated groups along a shaded path for a steady rhythm of blue-grey foliage.
• Combine with ferns and fine-leaved sedges for contrasting leaf shapes in woodland borders.
• Use beside white or pale pink astilbes to create a cool-coloured summer planting.
• Grow in a broad container in a shaded courtyard, with reliable watering and drainage.

Garden styles it suits: Woodland, Japanese, Blues and silvers, Modern courtyard, English country and Low-maintenance.

Plant it with: Japanese painted fern, Astilbe, Brunnera, Japanese forest grass, Hellebore and Epimedium.

Wildlife: Flowers provide nectar for bees and may attract hummingbirds in North America. Deer, rabbits, slugs and snails may feed on the foliage.

• Slugs and snails chew holes, especially in new shoots: inspect at dusk, remove hiding places near crowns and use iron-phosphate bait according to the label where needed.
• Deer and rabbits eat leaves and shoots: use suitable fencing or protect individual plants with a mesh barrier.
• Hosta virus X causes unusual mottling, ink-like bleeding along veins or distorted leaves: remove and discard affected plants, do not propagate them, and disinfect cutting tools between plants.
• Leaf scorch and brown edges develop in strong sun or dry soil: improve watering and move plants to a cooler, shaded position if necessary.

Toxic to cats, dogs and horses if eaten; all parts contain saponins that can cause vomiting, diarrhoea and abdominal discomfort. Most pet exposures cause digestive illness, but seek veterinary advice after ingestion. It is not generally considered poisonous to people, though raw plant material may cause stomach upset.

• Hadspen Blue hosta (Hosta 'Hadspen Blue')

  Another blue-leaved hosta, usually with rounder, more cupped leaves than the distinctly pointed leaves of 'Halcyon'; young plants can be difficult to distinguish.

• Blue Mouse Ears hosta (Hosta 'Blue Mouse Ears')

  Much smaller overall, with short, rounded, thick leaves rather than the larger, pointed leaves of 'Halcyon'.

• June hosta (Hosta 'June')

  A sport of 'Halcyon' with yellow to cream leaf centres and blue-green margins, rather than uniformly blue-grey leaves.

Hosta honours the Austrian botanist Nicolaus Thomas Host; 'halcyon' is an English word meaning calm or peaceful.

Propagation. Divide established clumps in early spring as shoots emerge, or in early autumn while the soil is still warm. Keep several shoots and healthy roots on each division, then water well. Seedlings do not come true to 'Halcyon'.

Accepted botanical name

Hosta

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