Highland Lakes Chapter

Texas Tree Diversity Field Trip – April 22

A wonderful rain the night before and slightly chilly temperatures made the joint field trip with the Highland Lakes Native Plant Society of Texas and the Highland Lakes Birding and Wildflower Society to a native tree nursery in Bertram even more exciting.

All the trees looked fantastic after their cleansing shower! The wildflowers perked up with Mother Nature’s watering. And a little bit of mud was a small price to pay for such a fun and educational field trip.

ISA Certified Arborist James Green gave the eighteen people who attended a “show and tell” about many of the trees in his nursery.

He talked about the traits and qualities of each tree, the provenance of most of the trees, and a bit about the best habitat and care for the trees.

The participants learned what to do for a tree that has lost its main trunk and is resprouting from the base. James taught us how to properly plant a tree from the pot into the ground using the native soil where the tree will be growing. We learned the best way to grow oak trees from acorns.

Having the opportunity to see, learn about and purchase some rare or hard-to-find native Texas trees—especially trees from the Texas Hill Country—was quite the treat.

About the Region

2026 Fall Symposium Logo

This low-elevations region of Texas extends inland from the barrier islands, about 60 or so miles, and stretches from Brownsville to Louisiana. In total, it covers about 9.5 million acres, with a high point of 150 feet in elevation. More than 1000 species of plants can be found in this region. On the southern end, species more common in Mexico (such as Sabal mexicana) and Central America occur.

The barrier islands provide us with dune systems, and clay flats to the inland side, which have species found in these areas alone. Many plants here, such as Ipomoea pes-caprae (beach morning glory), can be found throughout tropical regions of the globe. I’ve encountered the same species on the beaches of Guam.

Once inland, vast marshes and wet prairies occur. Occasionally, oak (Quercus fusiformis) groves can be found. Common grasses include species of Bothriochloa, Paspalum, and Sporobolus; eastern gamagrass (Tripsacum dactyloides); and switchgrass (Panicum species). Many rivers and creeks cut through the Gulf Prairies, and along these riparian areas various species of trees, Sabal minor, and other plants adapted to clay soils can be found. Due to overgrazing, farming, and fire suppression, woody species such as mesquite (Prosopis glandulosa) and huisache (Acacia farnesiana), and invasive species such as chinaberry (Melia azedarach), Brazilian pepper (Schinus terebinthifolius), and Chinese tallow (Sapium sebiferum) have increased and displaced our native flora.

Source: Wildflowers of Texas by Michael Eason