Inspect the stems of the heliconias to see if any flowering has occurred. Wait until the heliconias have fully flowered before doing any pruning or trimming.
Use garden shears to cut any unsightly or dying flowers from the tree. The stems of the heliconia plant only flower once, so it is good practice to completely sever the stem at the base of the plant after it has flowered.
Improve the look of your heliconias by trimming the spent stems all at once rather than individually. This will improve the airflow between the stems and increase the flowering of future stems.