Firefly heather, Calluna vulgaris 'Firefly', brings year-round color to sunny borders, rock gardens, and acid-loving beds. You get bright chartreuse to yellow new growth in spring, then richer tones through summer, followed by orange to brick-red winter foliage that keeps the plant lively when many perennials fade.
In late summer to early fall, short spikes of lilac to purplish-pink flowers rise above the tidy, upright stems. The compact, mounding habit makes it easy to tuck into the front of a bed, group in drifts, or use as a low, evergreen accent among conifers and other heath family plants.
Give it full sun to part shade and consistently well-drained, acidic soil. Heather does not like heavy, wet clay, especially in winter. If your soil holds water, amend the planting area or use a berm or raised bed to improve drainage while keeping the root zone cool and evenly moist during establishment.
Once planted, water regularly the first season, then water during extended dry spells. Mulch lightly with pine needles or fine bark to help conserve moisture and maintain acidity, keeping mulch off the crown. Avoid high-nitrogen fertilizer; a light, acid-forming feed in spring is plenty if needed.
For best form, shear lightly right after flowering to encourage dense growth and keep the plant from becoming woody. Mature size is about 24-30 inches tall with a 24-30 inch spread, so allow room for airflow and to show off the seasonal foliage shifts.