Iva hayesiana is a native subshrub endemic to San Diego County and northern Baja California Norte, found in coastal sage scrub, sandy washes, and disturbed ground near the coast. In California-native and low-water landscapes it fills the role of a spreading, low-maintenance ground cover for dry, open slopes.
The plant spreads by rooting along prostrate stems, forming a dense mat. It tolerates sandy or rocky soils low in organic matter and needs little to no irrigation once established. Fall planting aligns with Southern California's winter rain cycle and gives roots time to develop before the following summer. Soil drainage is critical; standing water promotes root failure.
Powdery mildew
White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.
Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.