After 10 years - first Yucca flower in our garden

We planted our
Yucca tree 10 years ago. It was a small, about 40 cm high, plant. Now it has over 3 meters of height. And this year, for the first time, a bright mass of white flowers protruded from a center stalk within the plant. Flowers !

Our species probably belong to Yucca mixtecana family.