The amount of water used for irrigation should be carefully regulated to avoid drought or waterlogging of the soil. Zantedeschia roots can be easily damaged if they are desiccated, so it is also important to prevent the soil from becoming too dry during the growing season. The amount of water applied to the crop after flowering should be reduced to facilitate plant senescence and help lessen tuber soft rots. Zantedeschias have surface feeding roots and if the roots are damaged soft-rot bacteria will readily invade the plant. Cultivation of the soil should be done carefully and only when necessary to avoid root injury - preferably after the plants reach flower initiation.
Several insects can damage roots, creating entry points for soft-rot bacteria.
A suitable spray programme should be implemented to control insect pests. Slugs should also be controlled. Because the bacteria require free water for motility and infection, harvest of flowers should not be carried out when it is raining or if the foliage is wet. Therefore, it is very important that the tubers are handled carefully during lifting. Lifting of tubers should only be carried out when the soil is dry, preferably when the temperatures are below 20C, and when the tubers are mature.