Frilly, that's about twice as deep as I planted them when given some in OH. I got some blooms the next year, but definitely not as many as the number of bulbs. Unfortunately I had to move before another year passed and didn't realize they were so unusual. I would have dug those up (again!) Maybe on yours, the flowers can't get through so much soil but the foliage can?
Sandy, 10 years in a pot? Maybe too crowded? They're for full sun in OH, but I wouldn't know about TX, that could be too hot there. I have L. radiata and L. aurea here, but no L. squamigera, so only know those from Z5. As far as I can tell, both of these are quite happy being in fully exposed spots here, though only enough L. aurea to have in 2 spots so far. L. radiata is everywhere, I found hundreds in the lawn.