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Calluna vulgaris 'Firefly'

firefly heather

Europe (Iceland through Scandinavia south to Mediterranean, east to Turkey and Urals; also Morocco and Azores; naturalized in northeastern North America; heathlands, moorlands, acidic bogs to 8,000 feet / 2,400 m)

Attracts Pollinators Deer Resistant Container Friendly

SunFull Sun

WaterMedium

HardinessZones 4–7

Overview

Calluna vulgaris 'Firefly' is a low mounding evergreen shrub in the heath family (Ericaceae spp.) reaching 12–18 inches (30–45 cm) tall with a spread of 18–24 inches (45–60 cm). The habit is dense and rounded. The cultivar is grown primarily for year-round foliage color rather than its flowers: spring and summer foliage is deep brick-red to terra-cotta, darkening to intense deep red through winter, and new growth tips emerge in spring with orange and gold, producing a warm fiery appearance concentrated at the branch ends. Tiny scale-like leaves 1–2 mm long are densely overlapping on wiry stems in the arrangement characteristic of the genus. Short racemes of small bell-shaped deep mauve-pink flowers 3–4 mm long open in August–September. Growth rate is slow at 1–3 inches (2.5–8 cm) per year. Hardy to zone 4. The cultivar requires acidic soil at pH 4.5–5.5; alkaline conditions cause chlorosis and decline. The shallow fibrous root system is drought-sensitive, so consistent soil moisture is required. In climates with hot humid summers (zone 8 and warmer), the plant declines from heat and root-zone stress; cool-summer maritime and montane climates suit the species better than continental humid climates.

Native Range

The species Calluna vulgaris is native to Europe, from Iceland and Scandinavia south to the Mediterranean and east to Turkey and the Urals, with additional populations in Morocco and the Azores and naturalized populations in parts of northeastern North America. It dominates heathlands, moorlands, and acidic bogs from sea level to 8,000 feet (2,400 m).

Suggested Uses

Grown in heather gardens, rock gardens, and the edges of acidic-soil borders at 18–24 inch (45–60 cm) spacing. The warm-red foliage carries the planting through winter when most perennials are dormant. Mass plantings that combine 'Firefly' with green-leaved and gold-leaved Calluna spp. cultivars produce a tapestry of foliage color and texture. Low ground cover on acidic sandy banks is another use. Container culture requires 2 gallon (8 L) or larger pots with ericaceous compost. Combines with other acid-loving plants including Erica spp., Vaccinium spp., and Pieris spp..

How to Identify

Separated from 'Spring Torch' by the deep brick-red to terra-cotta foliage held through summer (versus green base with multicolored spring tips). Separated from other red-leaved cultivars by the warm orange-gold spring tip emergence on the brick-red base and the winter darkening to deep red. Separated from Erica spp. species by the tiny scale-like leaves tightly appressed to the stem (versus the needle-like spreading leaves of Erica spp.). Year-round warm red to terra-cotta foliage on a 12–18 inch (30–45 cm) mound confirms identification.

Appearance

Size & Dimensions

Height1' - 1'6"

Width/Spread1'6" - 2'

Reaches mature size in approximately 3 years

Colors

Flower Colors

pink

purple

Foliage Colors

red

orange

Fall Foliage Colors

no change

Bloom Information

Bloom Period

~4 weeks

Summer Fall

Short racemes of small bell-shaped deep mauve-pink flowers 3–4 mm long open along the upper stems in August–September. Bloom duration is 3–4 weeks. Spent flower spikes persist on the stems through winter if not sheared. Flowers are visited by bees.

Detailed Descriptions

Flower Description

Deep mauve-pink, small bell-shaped, 3-4 mm in short racemes

Foliage Description

Brick-red to terra-cotta in summer, darkening to deep red in winter; spring tips orange and gold; tiny scale-like leaves 1-2 mm

Growing Conditions

Sun Requirements

SunFull Sun

Requires 6-10 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 Range4.5 - 5.5(Acidic)

357912

Soil Types

sand peat

Drainagewell drained

Water & Climate

Water Needs

Medium

Frost Tolerance

hardy

Time to Maturity

2-3 years

Care & Maintenance

Care Guide

Grows in full sun in well-drained acidic soil at pH 4.5–5.5, tolerating sand and peat substrates. Hardy to zone 4. Alkaline soils cause chlorosis and rapid decline; the shallow fibrous root system requires consistent soil moisture without waterlogging. Mulch 1–2 inches (2.5–5 cm) deep with pine bark or another acidic organic material to hold soil moisture and suppress weeds. Cool-summer maritime climates (Pacific Northwest, United Kingdom, Northwestern Europe) suit the species better than hot humid continental climates, where phytophthora root rot and heat stress cause decline. Good air circulation reduces fungal pressure. No serious insect pest problems are reported.

Pruning

Shear lightly in early spring (March–April) after the worst frost risk has passed, removing the spent flower spikes and the top 1–2 inches (2.5–5 cm) of growth. Annual shearing holds the dense compact mound and prevents the plant from becoming leggy and open at the base. Do not cut into bare old wood: Calluna spp. does not regenerate from leafless stems. Fall pruning removes the developing flower buds and reduces next year's bloom.

Pruning Schedule

early spring