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Outdoor freeze damage
The California Central Valley, in 2007, had an unusual week of sub-freezing temperatures—on several nights I recorded 22 degrees F. Here is what happened to unprotected plants.
(above) The Opuntia specimens suffered no damage. The large Golden torch was untouched, only the small Golden torch tips were frost burned.

(below) Golden torch was burned but by March had recovered and began growing. This will leave a ring like scar. Sunburned tips have similar scarring.

(below) Cold hardy San Pedro survived 22 degrees—except for the finger size tips.
(above) The larger tips contain enough water to buffer the heat losses of a night dipping down to 22 degrees F. You can see that smaller tips suffer and larger ones are more cold hardy.

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