Joyce Coulter ceanothus is well adapted to growing with the winter rainfall in the Inland Empire and periodic irrigation in the summer. Young plants will grow faster with moderate amounts of water during dry winter spells; established plants grow well with periodic deep irrigation in the summer. Ceanothus are vulnerable to disease problems and sudden death when summer irrigation produces moist soil and leaf litter conditions during the summer months. The chart shown below provides a recommended baseline guide to the monthly irrigation schedule and volume of supplemental water needed to maintain healthy growth throughout the average year. It should be noted there are several months marked by an asterisk (*) when winter rains can provide sufficient moisture and irrigation is not needed. The high and low range of moisture indicates it can grow with varying amounts of water; it is desirable to have leaf litter and the top layer of soil beneath the canopy to dry out between irrigation applications.

For more information on how to use this Irrigation Schedule and Graph, follow this link.

For information how to calculate your irrigation system’s schedule and precipitation rate, please follow this link.