Spanish lavender grows best on well drained soils with normal winter rains and low amounts of supplemental water during summer. Young plants will grow faster and flower longer with moderate amounts of water during winter and spring; established plants grow well with periodic deep irrigation in the summer. Lavenders are vulnerable to disease and rotting problems when their stems are covered in organic mulch and summer irrigation produces moist conditions. 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 stems 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.