Erythrina macrophylla, hawthorn, calla lily, cyclamen persicum, upside down golden bell and other flowers can't be watered. Among them, watering Erythrina macrophylla after dormancy will lead to root rot, and hawthorn has strong water storage capacity and slow growth in summer, so it doesn't need watering, while calla lily needs less water when its leaves turn yellow and fall off in summer.