Yellow bells or esperanza (Tecoma stans) are a drought-tolerant relative of the trumpet vine and produce bright yellow flowers during the summer and fall. A popular landscaping plant with an average height of four feet, the yellow bell is native to the Southern U.S.
How to Prune Yellow Bells
Prune or cut back unruly canes by cutting the cane all the way back to a main stem or to the ground. This will keep the plant's natural shape and can be done anytime.
Remove seed pods and spent blooms by cutting back each stem that recently bloomed by one-third. This is done after each bloom period.
Cut back bare stems to green wood in late winter while the plant is still dormant. Young esperanza plants may die all the way to the ground, so cut stems to the ground if the plant has no green wood. They will recover in the spring.