What hardiness zones is Polemonium caeruleum 'Snow and Sapphires' suitable for?

Polemonium caeruleum 'Snow and Sapphires' is suitable for USDA hardiness zones 4, 5, 6, 7, 8.

What are the sun requirements for Polemonium caeruleum 'Snow and Sapphires'?

Polemonium caeruleum 'Snow and Sapphires' requires Part Shade.

How much water does Polemonium caeruleum 'Snow and Sapphires' need?

Polemonium caeruleum 'Snow and Sapphires' has Medium water needs.

Polemonium caeruleum 'Snow and Sapphires' (Snow and Sapphires Jacob's Ladder)

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Perennials

Polemonium caeruleum var. Snow and Sapphires 'Snow and Sapphires'

Snow and Sapphires Jacob's Ladder

Polemoniaceae

Europe/N Asia parentage (Britain to Siberia/Japan; moist meadows, streambanks; variegated cultivar)

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At a Glance

TypePerennial

HabitClumping

FoliageDeciduous

Height18-24 inches (45-60 cm)

Width12-18 inches (30-45 cm)

Maturity2 years

Growing Zones

USDA Hardiness Zones

4 - 8

Zone 4 Zone 5 Zone 6 Zone 7 Zone 8

These zones indicate the coldest temperatures this plant can typically survive.

What's my zone? →

Frost Tolerancehardy

Key Features

Attracts Pollinators Attracts Butterflies Deer Resistant Container Friendly

Maintenancemoderate

Overview

Polemonium caeruleum 'Snow and Sapphires' is a deciduous perennial reaching 18-24 inches (45-60 cm) tall with a spread of 12-18 inches (30-45 cm) and an upright, clump-forming habit. This variegated cultivar has pinnately compound leaves with 15-27 leaflets, each broadly edged in bright white to cream-white, creating a variegated ladder effect. The blue to sapphire-blue, saucer-shaped flowers 0.8-1 inch (2-2.5 cm) wide appear in terminal clusters in May-June—the flower color is described as slightly deeper blue than 'Blanjou'. Growth rate is moderate. Hardy to zone 4. Similar to 'Blanjou' in form and variegation pattern. Partial shade essential for stable variegation—full sun scorches white margins. Can revert to all-green—remove green shoots promptly.

Native Range

Polemonium caeruleum is native to temperate Europe and northern Asia—from Britain and Scandinavia east to the Urals, Siberia, and Japan—in moist meadows, streambanks, and woodland margins. 'Snow and Sapphires' is a variegated cultivar.

Suggested Uses

Planted in shaded borders or woodland gardens at 12-15 inch (30-38 cm) spacing. White-variegated foliage with sapphire-blue flowers. Similar to 'Blanjou' in performance. Partial shade essential. Remove green reversions. Not suitable for full sun, dry sites, or hot climates.

How to Identify

Distinguished from 'Blanjou' (Brise d''Anjou) primarily by trade name and potentially slightly brighter white (versus cream-ivory) variegation and deeper blue flowers—the two are very similar in garden performance. Distinguished from the species by the white-variegated leaf margins. Distinguished from P. boreale by the much larger size (18-24 inches versus 4-8 inches) and the variegated foliage.

Appearance

Size & Dimensions

Height1'6" - 2'

Width/Spread1' - 1'6"

Reaches mature size in approximately 2 years

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~4 weeks

Spring Summer

Terminal clusters of saucer-shaped blue to sapphire-blue flowers 0.8-1 inch (2-2.5 cm) wide, May-June. Bloom duration 3-4 weeks.

Detailed Descriptions

Flower Description

Blue to sapphire-blue; saucer-shaped 0.8-1 inch; terminal clusters; May-Jun

Foliage Description

Green with bright white to cream-white variegated margins; pinnately compound 15-27 leaflets; variegated ladder effect

Growing Conditions

Sun Requirements

Partial Shade

Requires 3-5 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range5.5 - 7.0(Neutral)

357912

Soil Types

loam silt peat

Drainagemoist

Water & Climate

Water Needs

Medium

Frost Tolerance

hardy

Time to Maturity

1-2 years

Care & Maintenance

Care Guide

Plant in partial shade in moist, well-drained soil (pH 5.5-7.0). Hardy to zone 4. Partial shade essential—full sun scorches white margins. Consistent moisture needed. Remove all-green reverted shoots promptly. Cut back after flowering for fresh basal foliage.

Pruning

Cut back flower stems after bloom. Remove all-green reverted shoots at the base whenever they appear. Cut back to ground in late autumn.

Pruning Schedule

summer

Maintenance Level

moderate

Container Growing

✓ Suitable for container growing

Minimum container size: 2 gallons

⚠️ Toxicity Warning

Non-toxic