My Crinum moorei go dormant in summer, no matter of water I give them. They are already 'inactive' from a month and won't do absolutely nothing till late August, when the flower stalks will appear. If they don't get any water, they will loose almost all leaves, otherwise they will keep a good crown. They need partial shade in my area or they will get terrible sunburts on the leaves. In October they push all leaves together in a flush in the manner of cycads and the bulbs gain size suddenly. I haven't found them tender up to 28F, but a plant I gave to a friend in a colder town, was burnt totally at 24F. As I am in a coastal location, the only enemy is sea wind (gale!) which can disfigure the plants in few hours. Angelo Porcelli Italy zone 9b