Crinums, Lycoris and some of the others with which I'm familiar can be forced.
I'd like to see a "Forced" field included in the primary plant details since other plants can be forced into bloom as well. Some Euphorbias such as Poinsettias, also Thanksgiving, Christmas and Easter cacti can be forced, some Bromeliads like Tillandsias can be forced under specific conditions ... and so forth. I know there are others as well.
