Q.Walnut Tree’s Not Blooming
I planted 2 knee-high carpathian (walnut) tree’s about 11 yrs ago. They are probably 20-25 feet today, but they have not bloomed, nor any nuts at all ! Why not ???

Certified GKH Gardening Expert
They don't start producing till they are about 10 years old so yours should be about ready. Here is more:
https://www.gardeningknowhow.com/edible/nut-trees/walnut/planting-walnut-trees.htm
https://plantvillage.psu.edu/topics/walnut/infos/diseases_and_pests_description_uses_propagation