Arctostaphylos myrtifolia, commonly known as Ione manzanita, is a rare, evergreen shrub endemic to the chaparral and oak woodlands of the Sierra Nevada foothills in California. It is adapted to acidic, nutrient-poor soils and is often found on serpentine substrates. This slow-growing plant typically reaches just over 1 meter in height and width, with a distinctive form characterized by red, exfoliating bark and bristly branches. The small, bright green, glandular leaves are accompanied by urn-shaped, white to pale pink flowers that bloom from winter to early spring, followed by small, cylindrical drupes that are attractive to wildlife.

Ione manzanita is valued for its ornamental qualities, including its striking red bark and delicate flowers. It is used in native plant gardens and restoration projects within its range. Due to its specific soil requirements, it is best suited to similar conditions in cultivation, requiring well-drained, acidic soils and full sun to part shade exposure. While it is drought-tolerant once established, overwatering and poor drainage can lead to root diseases. The species is under threat in the wild, primarily due to fungal diseases like Phytophthora cinnamomi and Fusicoccum species, which cause root rot and branch canker. These diseases have led to significant mortality and hindered regrowth, contributing to the species’ federally threatened status and considerations for its endangered status upgrade. Gardeners should be aware of its susceptibility to these pathogens and take preventive measures when planting.CC BY-SA 4.0