Heuchera maxima, commonly known as Island Alum Root, is an evergreen perennial herb that thrives in the coastal sage scrub and chaparral of the Channel Islands of California. This species is particularly adapted to the unique ecological conditions of these islands, including dry summers and limited fresh water. Heuchera maxima forms a broad patch of large, rounded, multilobed green leaves with long petioles and a fringe of hairs along the edges, creating a lush groundcover. It grows 1–3 feet (30–91 cm) in height and produces an erect inflorescence up to 60 centimeters (24 inches) tall, with many clusters of hairy, glandular flowers. Each flower is rounded with fleshy white or pink lobes and tiny petals curling away from the center, while the protruding stamens are tipped with large anthers, blooming from late winter to early spring.

Island Alum Root is valued for its low water requirements, making it an ideal choice for water-wise gardens, xeriscaping, and as a groundcover in dry shade conditions, particularly under oaks. It is also used in traditional and wildlife gardens for its attractive foliage and flowers. While it prefers part shade, it can tolerate a range of light conditions and requires soils with good drainage. Gardeners should be aware that, although generally pest-free, it can be susceptible to root rot in poorly drained soils. Heuchera maxima is not known for aggressive roots or significant disease problems, making it a low-maintenance addition to the landscape.CC BY-SA 4.0