Hi Dennis:
Manfredas are rather undemanding gentle things. Those of
viriginica I have grown over the years stood slight frosts (down to - 6C)
and long hot warm seasons equally well in well drained soils. They are
obviously dormant in winter although evergreen and vigorous new growth
starts in spring . Flowers are produced in summer foloowed by plump seed
pods. Joe Shaw (Conroe Joe) is a nice bulb friend and knows many of
these plants in the wild. I am sure he can provide info on its hardiness.
My Texan ones are grown in 5 gallon containers and remain evergreen. My
Mexicans (and one from Cuba) have no foliage in winter and are kept dry then.
Regards
Alberto