Creating Grove Management Plans to Protect Western Monarch Butterflies
For years, California State Parks Foundation has supported western monarch butterfly conservation in California state parks by funding education, outreach, research, and programming. California State Parks is the single largest land manager for overwintering groves — coastal sites where western monarchs migrate every winter — so they play a key role in preserving these sites. One focus has been working with The Xerces Society on the development of overwintering grove management plans, which provide a detailed and adaptable process to assess habitat health, identify and address threats, and enhance current groves. Priorities outlined in each plan include maintaining or improving windbreaks (since overwintering monarchs require shelter from high winds) while ensuring adequate sunlight reaches clustering monarchs; reducing causes of monarch mortality; and increasing native, fall, winter, and spring blooming nectar resources.
The location and structure of overwintering sites provide a particular microclimate that cannot be replaced if lost. Monarchs are also particularly vulnerable while overwintering. Therefore, having a detailed management plan to preserve and restore these groves is critical for the western monarch butterfly’s population recovery.