Garden Scheme
Plant library · Perennial Flowers
Tiarella cordifolia
Foamflower is a low perennial groundcover for the quiet, shaded parts of a plan: beneath trees, along sheltered bed edges, or across a woodland-style planting. It makes a spreading layer about 1 foot tall and 1 1/2 feet wide, then sends up foamy white flower spikes from mid spring into early summer. Its native character and pollinator-friendly bloom make it useful where a planted ground layer is wanted rather than open mulch.
Space Foamflower 18 inches apart, measured center to center (45 cm).
The mature spread is about 18 inches (45 cm), so neighboring plants just meet at maturity without crowding.
Treat 18 inches as a planning baseline — cultivar and local growing conditions shift the final footprint.
Use foamflower in full-shade beds where its low foliage can knit together the front of a planting without blocking views into it. Set it in drifts beside paths, at the feet of shrubs, or around the outer edge of a tree-shaded bed, leaving a reachable path or stepping access nearby for cleanup and division. It spreads by slender runners to form colonies, so give the planting a defined edge where it meets lawn, paving, or slower-growing neighboring plants.[1]
Plant on 18-inch centers for a continuous groundcover layer. That spacing matches its mature 1 1/2-foot width, allowing neighboring plants to meet as the patch fills while keeping the individual crowns legible at establishment. In a mixed bed, reserve this width at the front or between taller, more upright plants; avoid squeezing it into narrow gaps that need to remain open for stepping or edging.
Keep foamflower in full shade and provide regular moisture so the planting does not dry out. A humus-rich, moisture-retentive soil with good drainage suits a stable groundcover patch. Place it away from spots that are both wet and slow to drain in winter, such as the bottom of a compacted swale or the runoff side of an impermeable path.[1][2]
The main floral display arrives from mid spring to early summer, when pale spikes rise above the foliage and add a light vertical accent to the shade bed. Plan the surrounding planting so emerging spring bulbs, taller later perennials, and shrub growth do not hide this low layer. Remove spent flower stems or damaged foliage when a tidier edge is needed.[1][2]
This is not a dry-shade filler. In a bed with strong root competition from mature trees, build in a regular watering route rather than relying on occasional rainfall. Its runnering habit also means that a small initial group is better suited to a contained groundcover area than to isolated pockets between plants that need fixed spacing.[1][2]