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Greenhouse freeze damage
The California Central Valley had an unusual week of sub-freezing temperatures in 2007. The daytime temperatures were in the 40s to 50. But at night it dipped to the mid 20s. On several nights I recorded 22 degrees F.

My greenhouses are not heated. They are technically called "cold frames." But the daytime heat gain is stored in the plants soil and water. So the night time drops were buffered somewhat and the plants were not exposed to continuous 22 degree lows. To help them survive they were watered during the warm part of the day.

(Below) notice how this Bridgeseii had the tip frost burned yet by March had sprouted an offset tip.
(right) Even though this looks bad you should not cut it off during the winter. Wait until spring when the plant's immune system wakes up.

Tip damaged plants such as this one make excellent stock plants since they will offset new tips that can be harvested & rooted into new plants.
These are finger sized tips growing off an old log. Their small size made them the most vulnerable of all the San Pedro in the growing house. They were the only ones to suffer burned tips. At first I thought they would die and rot off but instead started to grow again.
(below) Don't cut frost damaged tips unless you have to. The plant's immune system is weak during the dormant (winter) period. Cutting a tip can lead to infection & rot. Having said that, I did have to cut one Bridgeseii tip off because the dead tip was spreading rot to the column below it. Fortunately it healed up fine.

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