April 15 and 16
Tellus Mater
The Italian deity Tellus Mater–mother of the earth–was honored on this day. She was a very early fertility deity (later associated with Jupiter) who watched over marriage, the procreation of children and the fruitfulness of the soil. Her festival was managed by the pontifices and the Vestal Virgins, at which a pregnant cow was sacrificed to ensure plenty throughout the year. In modern times, this day is traditionally devoted to prayer for the continued health of our environment.
A Simple Prayer of Gratitude
Without Thy sunshine and Thy rain,
We would not have the golden grain;
Without They love we’d not be fed,
We thank thee Lady for our daily bread.
Source
Celebrating Wiccan Spirituality
Spells, Sacred Rites, and Folklore for Each Day of the Year
Lady Sabrina, Author of Exploring Wicca
Witches Of The Craft® 