This is what is known as a Century plant: AKA Agave plant.
One during its lifetime, it grow this huge bloom reaching upwards 15-20 feet, where it blooms then dies.
Tequila is made from the stump, as the nectar is very sweet.
I am surprised that it survived given the extreme cold temps we had; around 5 degrees.
The freeze was around February 15. It has grown this much since then.