These large, tropical plants have showy flowers in orange or white and large leaves that unfurl during growth. Prevalent in the south, Birds of Paradise have large root systems that require several steps to remove. Since the plant can grow back from the roots, it is important to remove the entire root system.
Cut the plant back to the ground using a chainsaw or pruners. Keep the chainsaw dry and free of debris because the leaf stems are succulent and could interfere with the proper operation and effectiveness of the chainsaw.
Dig around with a pointed spade to expose the root system, which in addition to being wide may be more than 1 foot deep. Remove as much dirt as possible above and around the root system.
Beginning at the top, cut and scrape away chunks of the root system using the spade. The key part of the root is the crown, which usually is found at the end of the root system. Remove the crown with the spade if it can be located. This will kill the plant.
Pour weed and root killer onto the remainder of the root and cover it with a tarp or piece of wood to block out sunlight. Remove the tarp after about two weeks and the root should have begun to decay, making it easier to remove.