Mistletoe may be a welcome holiday sight when hung over a doorway if a loved one is near, but, it can be an unwelcome intruder when found in your trees, said a Texas A&M AgriLife Extension Service horticulturist.“Mistletoe is a hemiparasite – a semi-parasitic plant,” said Allison Watkins Schwarz, AgriLife Extension horticulturist for Tom Green County. “It makes its food from photosynthesis, but the roots grow into the host tree, sucking water and minerals out from the sap.”In other words, you likely do not want to see mistletoe growing on your favorite shade tree or prized ornamental. Because once it ...