Rodgersia Sambucifolia. The elderberry rodgersia is a common name given to this unique plant as it has large deeply pinnate dark green leaves that resemble those of the sambucus. A clump forming perennial that loves a moist spot with part shade. Large airy plumes of tiny creamy white flowers emerge in summer reminiscent of an astilbe. Slow to naturalize but will eventually spread to 1.2m by rhizomes. Reaching heights of 1.2m.