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Strawberries and Caneberries
University of California Agriculture and Natural Resources Agriculture and Natural Resources Blogs
WED, JAN 19 2022
by molly shaw
on October 31, 2021 at 6:26 PM
Hi Mark,  
I'm wondering if you could share your formula for calculating chilling? Here in NZ the runner plants don't get chilled at all in the nursery, but fruiting plants are planted in autumn and get chilling in the fruiting beds. I'm curious to run a few numbers and see if we're getting enough chilling. We grow mostly california varieties like Monterey.  
by Mark Bolda
on November 1, 2021 at 8:55 AM
Molly, you should go to the UC Davis Fruits and Nuts website and look under chilling. There are several models explained there, I favor the "Utah model" which emphasizes chilling hours between 34- 45 degrees F, with less emphasis on the slightly cooler and warmer. Really warm detracts from chill, so that is why I have been noting the temperatures above 60, which fortunately in our case have been early in the process and not later.  
I have found when working with growers that the idea of chill reversal in very warm temperatures gets disputed, although to me it makes a lot of sense. It would be similar to be woken up from sleep in the middle of the night, maybe even several times. You would not at all feel rested in the morning!
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