It’s not hard to spot Agave Sisalana when they put their flower stems 20 feet or so into the air. The problem with that, in a place like North Kohala, is that the trade winds have a tendency to knock them over. They can block roads and driveways, but they’re not like giant trees. They’re pretty easy to cut up and remove.
Even when they’re laying horizontal, so long as there’s some attachment to the ground, the plant will survive and produce flowers.