Very pretty banner, Luka.
Could you please post a photo of the whole plant?
Yuccas are amazing plants, and grow natively here,
surviving severe drought & wildfires.
According to the
Wiki article. 
The petals are blanched for 5 minutes, and then cooked "a la mexicana" (with tomato, onion, chile) or in tortitas con salsa (egg-battered patties with green or red sauce). In Guatemala, they are boiled and eaten with lemon juice.
In El Salvador, the tender tips of stems are eaten, and known locally as cogollo de izote.
Bon Appétit!
when I opened the thread. The blooms make a beautiful and unusual banner. I think we all love seeing something like that.
