Mphero ya singano ya WZM ndichida chamakono chopera bwino. Amagwiritsidwa ntchito kwambiri pokonza wowuma ndi zipatso m'minda ya zipatso monga chimanga, mbatata, nyemba, ndi zina zotere. Njira, sinthani zokolola, ndikukhala ndi phindu lalikulu lachuma.