It may be found in marshes, alkali flats, beaches, meadows, seeps, and vernal pools.
It is also sometimes associated with vernal pool plant communities.
Since the calendar uses astronomical calculation for determining the vernal equinox, it has no intrinsic error, but this makes it an observation based calendar.
The colour green would indicate simplicity and vernal productiveness.
The local habitat is made up of chaparral and oak woodland with occasional vernal pools and summer-dry creek beds.
The main feature of the trail are seasonal vernal pools which support threatened and endangered species including tiger salamander and spadefoot toad.
The day of its celebration was the first after the vernal equinox, or the first day of the year which was longer than the night.
In one version of this definition, winter begins at the winter solstice and ends at the vernal equinox.
