Trumpet vine can be propagated by cuttings, layering, root division, or seeds.
Cuttings
- In summer, use clean shears to take a cutting from a healthy vine.
- Remove leaves from the bottom half of the cutting.
- Dip the cutting in rooting hormone if desired.
- Plant the cutting in a container with potting soil.
- Keep the soil moist and the container in a shady area for at least a month.
- Dig up the shoots in late winter or early spring and plant them in a larger container or garden.
Layering
- Choose a flexible young stem and bend it down to the ground.
- Nick the stem with shears to encourage rooting.
- Gently pin the stem into the soil and water.
- Once roots are strong enough, cut the new plant from the parent and pot it up.
Root division
- Dig up suckers or shoots from the trumpet vine in late winter or early spring.
- Cut pieces of root that are about 3 to 4 inches long.
- Plant the root pieces just beneath the soil and keep them moist.
- New growth should appear within a few weeks or a month.
Seeds
- Sow seeds into seed compost in autumn.
- Place in a cold frame where the seeds should germinate in spring.
- It may take several years for the vine to flower.
For best results, keep the cuttings in a comfortable, climate-controlled room with consistent warmth and moderate humidity.