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Family: Rutacae Genus: Casimiroa Species: edulis The white sapote is a relative of citrus. However, it is too distant botanically for the fruit to resemble, be graft compatible, or hybridize with citrus.
Many deciduous varieties require more winter chilling than we get in Sunset zones 21-24, so will not flower and leaf out appropriately. These selected varieties have been shown to consistently produce in our mild winter areas.
Zone 18. Hilltops and Valley Floors of Interior Southern California Growing season: mid-Mar. through late Nov. Summers are hot and dry; rain comes in winter, when lows reach 28 degrees to 10 degrees F/-2 degrees to -12 degrees C. Plants from the Mediterranean and Near Eastern regions thrive here.
Deciduous fruits and nuts drop their leaves and produce new leaves and flowers in response to temperature. The temperature to which they respond is measured in chilling hours. For use in selecting fruit varieties we count each hour below 45 degrees F as a chilling hour.
Avocado root rot. We talk about it, we pay for research to control it, we invest in clonal rootstocks to avoid it, but are we doing our best to prevent it? I pose the question, because recently I was called out to inspect a grove I had seen a year before where I was sure the disease was rampant.
