Trouble Growing Alliums in Atlanta

Q: I have trouble growing alliums in Atlanta. If they come up, then they don’t
come back next year. Am I planting the wrong varieties? 

A: As easily as wild onion, Allium canadense, grows in lawns, you’d imagine
that any member of this genus would grow well in Georgia. I have planted
several species and varieties of ornamental onion over the years but most did
not succeed. The one I had to most hope for, Allium christophii, did great,
with huge blooms, for a couple of years and then petered out. My friend Erica
Glasner says she has had the best success with ‘Millenium’ ornamental allium.