I've seen quite a few of these weird plants in this part of the world.

Plant with a very long stalk that droops to form a sort of semicircle.

Siri tells me:

This appears to be an Agave attenuata, commonly known as the Foxtail Agave or Swan's Neck Agave. It is known for its distinctive, curved flower stalk that can reach up to 10 feet in height.