Your trees would appreciate it if you removed the grass from around their trunk. I see you have a Bahia orange. The Bahia orange tree is the variety that was originally imported from Brazil into the USA in 1870 by the USDA. The USDA then sent out out from Washington two of the trees to Mrs. Luther C. Tibbes, of Riverside, California who grew them in her yard.. The trees were among the first to bloom and fruit in the USA. It is from these two trees, one of which still is living, that the navel orange industry of California and mainly of the world has developed. The variety came to be referred commonly as the Washington Navel orange, and was distributed under that incorrect name. Later horticulturists attempted to introduce the correct name, Bahia, but to no avail: the markets had become so familiar with the designation Washington navel that it could not be supplanted. We would be interested in seeing the rest of your citrus collection.