Astilbe, Rheinland Overview Category: Perennials Common Name: Astilbe, Rheinland Botanical Name: Astilbe japonica 'Rheinland' Sun Exposure: Full shade to part sun Height: 24-30 in. Spread: 18-24 in. See notes | Back to perennials Notes Beautiful spikes of carmine-pink flowers in June. Showy perennial for rich summer color in shady areas. Best grown in evenly moist soils.