Pruning should be done in the late winter or early spring. For mature plants, trumpet creeper tolerates heavy pruning to control its spread and maintain a desired size. Prune annually, spur-pruning lateral shoots back to within two or three buds of the main stems. Remove weak and diseased growth.Click to see full answer. Accordingly, should I trim my trumpet vine?A bit more information: Trumpet vines bloom on new growth and can be pruned late winter or early spring. Prune established plants yearly to control the rampant growth. Remove weak and damaged stems back to the main framework. Cut the side shoots back to two or three buds from the main stems that form the framework.Similarly, how do you winterize a trumpet vine? However, experts advise gardeners overwintering trumpet vines to cut them back severely in winter. Trumpet vine winter care should include pruning all of the stems and foliage back to within 10 inches from the surface of the soil. Reduce all side shoots so that there are only a few buds on each. Also to know is, how do I stop my trumpet vine from spreading? 4 Natural Remedies to Get Rid of Invasive Trumpet Vines Dig up the Root System. Trumpet vines spread in several ways but the most common method tends to be through the roots. Kill the Plant with Hot Water. Cut the trumpet vine at ground level then pour boiling water around the base of the plant. Spray the Plant with Diluted Vinegar. Apply Rock Salt to the Soil. How often do you water a trumpet vine?Once it’s established, trumpet vine watering needs are minimal to moderate. During the summer, it needs about an inch of water per week, which is often taken care of naturally by the rain. If the weather is especially dry, you may need to water it once per week yourself.