Species

Picea pungensColorado Spruce

1 other cultivar

‘Globosa’Globe Blue Spruce

treeN. America Native

Koster Blue Spruce

Picea pungens 'Koster'

The Story

Plant Bio

Koster Blue Spruce is known for its striking blue foliage and conical shape, making it an attractive evergreen choice for landscapes.

Distinguished by its intense silvery-blue needles and a pyramidal form. Young trees may have a more irregular or pendulous habit, maturing to a classic spruce shape.

Uses & Benefits:

Provides year-round visual interest with its striking blue foliage, ideal for focal points and hedges.

Acts as an excellent windbreak and privacy screen in residential landscapes.

Supports local wildlife by offering shelter and nesting sites for birds.

SpeciesPicea pungensColorado Spruce

Essentials

At a Glance

Plant Type

Tree

Height

480 inches

Width

180 inches

Light

Full Sun

Zones

4, 5, 6, 7

Water

Moderate, drought-tolerant once established

Humidity

Prefers moderate humidity

Lifespan

Over 50 years

Native To

Western North America

Toxicity

Non-toxic to humans and pets

Planting

How to Grow

Select a sunny location with well-draining soil to plant the Koster blue spruce.
Tuck young seedlings into the ground, ensuring roots are spread evenly and covered with soil.
Mist cuttings regularly to maintain humidity during propagation; roots typically develop in 6 weeks.
Water deeply after planting and keep soil moist but not waterlogged during first year.
Apply mulch around the base to retain moisture and regulate soil temperature.
Prune dead or damaged branches in early spring to maintain shape and health.

Pro Tip

Ensure good air circulation around the plant to prevent fungal diseases and promote healthy growth.

Keep It Thriving

Care Guide

Do

Water deeply during dry spells 🌱
Prune to shape in early spring
Mulch to retain soil moisture
Provide full sun exposure

Don't

Avoid overwatering to prevent root rot ❌
Don’t prune in late fall or winter
Never plant in poorly drained soil
Avoid fertilizing in late fall

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Mulch
Pest Check
Plant
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Evergreen hedge with silvery-blue foliageSpecimen tree in a formal gardenBackground planting for year-round interest

Companion Plants

Hostas Daylilies Ferns Lavender Sedum

Multiply

Propagation Methods

Good to Know

Common Questions

Koster Blue Spruce questions

What zones can Koster Blue Spruce grow in?

Koster Blue Spruce is hardy in USDA Zones 4–7. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Koster Blue Spruce deer resistant?

Yes — Koster Blue Spruce is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

Does Koster Blue Spruce need full sun?

Koster Blue Spruce does best in full sun (6+ hours).

Is Koster Blue Spruce drought tolerant?

Yes — once established (usually after the first full season), Koster Blue Spruce handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.