Cactus / Ferocactus

I bought several mixed cactus seeds and sowed in 2000.
One of young seedlings was grafted onto a Hylocereus stock.
I degrafted later and rooted.
The scion is in outdoor, in my backyard.
The current size is 30 cm diameter and gets the 1st flowering.
Since the climate in here is similar to the habitat, strong spins are formed well.
The plant is an unknown name Ferocactus.