Took several well producing cherimoyas from our home on Central Coast to home in Todos Santos, Baja Sur, Mexico south of the Tropic of Cancer. Even though they grew well, flowered, they never set fruit. Guanabanas and other annonas fruited there. Hand pollination didn't help. Variety of cherimoyas continue to do well here in Nipomo. Factors other than heat is present there, but surmised it was the heat.