By L Mac
Trumpet vines take over everything, even come up in our lawn. We are digging it out root by root. It is impossible to get rid of with weed killer etc.
When I was a child we had a trumpet vine growing up the corner of our house. We never pruned it or cut it down. They grow about roof high so dont plant one in too small a space and you'll be all right.
It's not necessary to prune them to the ground. New growth comes off old stalks.
If it gets too big trim what you don't want. Tough plant to kill if you want too!
You said, "I thought it was like my clematis, which I cut down each year." Some clematis you do, others you don't cut back.
You can't kill a trumpet vine even when you try to. I live farther south than you and mine hasn't starting budding yet. If just a piece of the root survives, the plant will flourish.
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