I-35 Monarch Waystations

In 2016, through a major joint working arrangement between the US Fish and Wildlife Service, the Texas Department of Transportation and the Native Plant Society of Texas, the support and creation of four Monarch Pollinator Gardens located at four Safety Rest Areas along busy I-35, were created. This effort was caused by the national recognition that both pollinator and bird species have had a drastic decline since the 1970’s and in particular, the number of the uniquely migrating Monarch Butterflies were in especially precipitous decline.

The Monarchs are amazingly unique. They will spend their winters in Mexico then beginning in April will take flight and begin their long spring migration to the northern United States and Canada. In fall, they will return to Mexico and begin the great cycle all over again.

Their migratory path, both in spring and fall, funnel through Texas and more specifically often through the central Texas corridor along busy I-35.

In the spring, Monarch Butterflies are in dire need of milkweed plants on which they lay their eggs. In the fall they need nectar plants on which they fuel themselves for the long journey to their winter homes.

Through the hard work and dedication of countless volunteers over the last 8 years, these wonderful migration gardens have provided the necessary milkweed and nectar plants in attractive migration gardens that are helping to keep the monarch population alive.

During their monthly work sessions, volunteers regularly hold Bring Back the Monarch educational sessions which explain the value and role of native Texas plants to visitors of the Safety Rest Areas.

Wonderfully designed NPSOT created coloring books and crayons are given out to the kids who, as they travel with their families north and south along busy I-35, The Monarch Way, understand that they also share the highway and their travels, not just with their families, but with the wonderful Monarch Butterfly!

This NPSOT project provides a wonderful opportunity for those folks who like to get their hands in the dirt as well as those who like to gab about the benefits of using Texas Native Plants. These gardens are interesting and busy with a constant stream of visitors who appreciate our efforts and provide many opportunities to interact, to educate and to make a difference.

Please considering Volunteering for this opportunity to apply your interest, skills and knowledge, in a meaningful way.

Contact i-35.mwsra@npsot.org for more information.

Rest area off southbound Interstate 35 near Hillsboro with demonstration wildflower garden and monarch waystation

Rest area off northbound Interstate 35 near Hillsboro with demonstration wildflower garden and monarch waystation

Rest area off southbound Interstate 35 near Salado with demonstration wildflower garden and monarch waystation

Rest area off northbound Interstate 35 near Salado with demonstration wildflower garden and monarch waystation

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