Bigleaf Hydrangea 'Lanarth White': Classic Lacecap Elegance

Bigleaf Hydrangea 'Lanarth White': Timeless Lacecap Beauty

Hydrangea macrophylla 'Lanarth White' is a venerable lacecap cultivar celebrated for its large, pure white sterile florets that create a striking contrast against the central cluster of tiny fertile flowers. A garden classic since the mid-20th century, it remains a benchmark for white lacecaps.

Floral Architecture

The lacecap inflorescences are broad and flat, 6–8 inches across, with a prominent central dome of small, pale blue to pink fertile flowers (color varies with soil pH). Surrounding this is a generous ring of large, cupped, pure white sterile florets—each distinctly notched at the apex. The effect is crisp, clean, and highly ornamental. Blooms appear in early to midsummer on old wood.

The shrub grows 4–6 feet tall and wide, with sturdy stems and deep green, serrated foliage.

Cultivation

Best in morning sun or dappled shade with consistent moisture. Rich, well-drained soil amended with organic matter. Hardy in USDA zones 6–9. To preserve the white color of sterile florets (which don't change with pH), soil acidity only affects the central fertile flowers. Prune only dead wood in spring; winter protection in zone 6.

Taxonomic Profile

• Family: Hydrangeaceae
• Genus: Hydrangea
• Species: macrophylla
• Cultivar: 'Lanarth White'

Garden Merit

'Lanarth White' brings a cool, sophisticated presence to shade borders. Its white florets glow in twilight, making it ideal for evening gardens. Pair with blue-flowering companions (hostas, irises) to echo the fertile flower color, or with dark green foliage plants for contrast. A reliable, time-tested performer with enduring appeal.