The core problem with trumpet vines breaks into three areas that you need to know before planting one. Aggressive spreading takes over your yard fast. Aerial rootlets cause real structural harm to your home. And the sap triggers skin rashes in many people. These showy vines look great on a trellis, but they demand more work than most climbers you can grow.
I found out about the trumpet vine invasive habit the hard way after planting one on my backyard arbor. Within two seasons, suckers popped up in my flower beds. They pushed through cracks in my patio pavers. Some shoots appeared 10 to 15 feet (3 to 4.5 meters) from the parent plant. Pulling them out became a weekly task all summer long. I also spotted new seedlings in beds on the far side of the yard where I had never planted anything.
Your vine spreads through three separate paths at once. Underground runners travel far from the base and send up new shoots wherever they find light. Seed pods that grow 3 to 6 inches (7.5 to 15 centimeters) long split open in fall and scatter winged seeds across your yard. On top of that, aerial rootlets grip onto any surface the vine touches. This triple threat makes trumpet vine invasive behavior tough to stop once it gets going in your garden.
Trumpet vine damage to structures worries homeowners the most. NC State Extension rates this vine as high maintenance for good reason. Its aerial rootlets burrow into porous surfaces like your wood siding and brick. Those tiny roots leave permanent marks even after you rip the vine away. A mature plant can reach 30 to 40 feet (9 to 12 meters) tall. That much weight pulls on your gutters and loosens mortar joints over time. Some gardeners I know had to repoint entire brick walls after removing old vines that had been climbing for years. The cost of repairs can run into hundreds of dollars depending on how long you let the vine grow unchecked.
Skin irritation is the third major issue you should know about. The flowers and leaves contain a substance that causes contact dermatitis. If you touch them bare-handed, you might get redness, itching, and sometimes small blisters. The reaction feels like a mild case of poison ivy. People gave the plant the nickname cow-itch vine for good reason. I got a red itchy patch on my forearm during my first pruning session without gloves. Not everyone reacts the same way, but you don't want to find out during a big trim job.
You can manage these problems if you plan ahead and stay on top of maintenance. Install rigid root barriers 18 to 24 inches (45 to 60 centimeters) deep around the planting area. Grow your vine on a freestanding metal structure away from buildings. Pull suckers every week during the growing season and snip seed pods before they split open. Wear gloves and long sleeves for every pruning session. These steps keep the vine under control while you still enjoy hummingbird visits all summer.
If your trumpet vine already sits against a house wall or near your foundation, removal makes more sense. Trumpet vine damage to these surfaces gets worse each year you wait. Dig out the root system as deep as you can and remove every runner piece you find. Then watch for regrowth over the next two to three seasons since stray root bits will try to sprout again. Crossvine gives you a similar look and still draws hummingbirds. You get all the beauty without the headaches that come with trumpet vine.
Read the full article: Trumpet Vine: Care and Growing Guide
