Dwarf globe blue spruce

Sun

Full sun gives the strongest blue colour and densest growth.

Water

Keep the root zone evenly moist while establishing. Established plants tolerate some dry weather, but need deep watering during prolonged drought; avoid waterlogged soil.

Soil

Well-drained loam, sandy loam or clay improved by good drainage; tolerates acidic to moderately alkaline soil.

Height

3-5 ft (0.9-1.5 m) in about 10 years; older plants may reach 6-10 ft (1.8-3 m). Grafted standards start higher.

Spread

4-6 ft (1.2-1.8 m), sometimes wider with age.

Foliage

Evergreen. Short, sharply pointed, stiff needles with a waxy silver-blue coating; new spring growth is often especially bright.

Growth

Slow, commonly 2-4 in (5-10 cm) a year.

Care needed

Low

• Deer resistant
• Cold hardy
• Wildlife

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

   1.6 ft (0.5 m)

2. After 1 year

   1.9 ft (0.59 m)

3. After 2 years

   2.2 ft (0.68 m)

4. After 3 years

   2.5 ft (0.76 m)

5. After 5 years

   3 ft (0.94 m)

About 8 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

Native to

the US

Growth rate

Slow

• Plant with the root flare at soil level and leave enough room for its eventual spread.
• Water deeply during dry spells for the first two growing seasons; let the surface soil begin to dry between waterings.
• Apply 2-3 in (5-8 cm) of organic mulch over the root zone, keeping it clear of the trunk.
• Feed only if growth is weak or a soil test shows a deficiency; avoid heavy nitrogen feeding.
• Keep lawn sprinklers off the needles and allow air to circulate around the plant.
• On grafted plants, remove shoots arising from the trunk below the graft union.

Pruning. Little pruning is needed; remove dead or damaged branches in late winter or early spring. If necessary, shorten selected new shoots in late spring to retain a rounded outline, but never cut back into bare old wood.

Early spring

Plant while the ground is workable, before hot weather, and water thoroughly.

Spring

Refresh mulch and check older inner needles for spotting, browning or premature shedding.

Late spring

Lightly shorten selected new shoots only if the outline needs correcting; remove growth below any graft.

Summer

Water deeply during prolonged dry spells and inspect dusty or mottled needles for mites.

Autumn

If rainfall is low, water before the ground freezes, especially for recently planted specimens.

Winter

Avoid piling salted snow beside the plant; gently brush off loose, heavy snow without striking frozen branches.

• Use as a blue-grey focal point in a sunny gravel garden with low sedums and creeping thyme.
• Repeat rounded plants along a broad path or terrace for year-round structure without a clipped hedge.
• Pair with dark green evergreens and burgundy-leaved shrubs to make the blue foliage stand out.
• Place among rocks and low mountain plants, allowing space for its broad mature outline.

Garden styles it suits: Architectural minimal, Formal, Dry gravel garden, Winter interest, Mountain lodge and Alpine rock garden.

Plant it with: Creeping thyme, Creeping phlox, Stonecrop, Blue fescue, Dwarf mugo pine and Japanese spirea.

Wildlife: Dense evergreen branches provide shelter and occasional nesting cover for small birds. It offers little nectar or pollen value for garden pollinators.

• Needle cast: older inner needles turn purple-brown and drop, often starting low down. Keep foliage dry, improve airflow and obtain a diagnosis; confirmed cases may need locally approved fungicide treatment timed to new growth.
• Spruce spider mites: needles become finely mottled, dull or bronzed. Check by tapping branches over white paper; rinse small plants with water and use a locally approved mite treatment if damage continues.
• Cytospora canker: branches die back, sometimes with white resin on the bark. Prune affected branches in dry weather, disinfect tools between cuts and reduce drought or root stress.
• Poor drainage or excessive heat: persistent wet soil can kill roots, while hot, humid conditions encourage decline. Choose a freely draining site and a different shrub where summers are consistently unsuitable.

Not known to be toxic to cats, dogs, horses or people. The sharp needles can puncture skin or irritate the mouth and digestive tract if chewed; eating woody material is not safe.

• Montgomery blue spruce (Picea pungens 'Montgomery')

  Also has blue needles, but usually develops a more upright, densely pyramidal outline. Young plants can be difficult to distinguish without a reliable label.

• Dwarf Alberta spruce (Picea glauca 'Conica')

  Forms a narrow, regular cone with much finer, predominantly green needles rather than a broad globe with stout silver-blue needles.

• Globe Norway spruce (Picea abies 'Globosa')

  Has green rather than silver-blue needles and generally finer-textured growth; check the full botanical name when buying.

Pungens means sharply pointed, referring to the prickly needles, while 'Globosa' refers to the plant's rounded young shape.

Propagation. Usually propagated by grafting to preserve the cultivar; this is specialist nursery work. Cuttings can be difficult to root, and seed-grown plants will not reliably retain its blue colour or dwarf shape.

Accepted botanical name

Picea pungens

In the US and Canada

Native in the lower 48 states. Introduced in Canada.

Native range

Arizona, Colorado, Idaho, Montana, New Mexico, Utah and Wyoming.

Measured

Soil pH 5.5 to 7.8. Average height 3024 cm.

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