San Antonio Chapter

Mailbox Planters

Mailbox Planters
Submitted by Pam Peck

Ever wonder what to plant in that problematic little mailbox planter? While it’s intended as a living and attractive welcome, it’s often anything but living or attractive. 

The mailbox planter is a poorly conceived idea – a tiny raised island of green between the sidewalk and street with lots of reflected heat, prone to drying out long before any rain shower offers relief, and often poorly drained when it does rain. No wonder exasperated homeowners resort to perky silk flower bouquets, which the intense Texas sun quickly fades to artificial tackiness!

However, on a recent walk around my neighborhood, I spotted two solutions using native plants that are often considered problematic weeds – the dreaded purple bindweed (Ipomoea cordatotriloba) and Sorrelvine (Cissus trifoliata). I’m guessing that neither of these natives was planted intentionally but gifted by a bird. In all likelihood, these natives became established due to homeowner neglect or a “well, at least it’s green” desperation. But given time, these happy accidents could prove to be attractive and hardy solutions to the mailbox planter quandary. 

Check out the links to Purple Bindweed and Sorrelvine:

https://www.npsot.org/posts/native-plant/ipomoea-cordatotril…

https://www.npsot.org/posts/native-plant/cissus-trifoliata/

About the Region

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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