Frost is not predicted along the coast of So Cal this week, it just feels like it's freezing. But if you are the proud possessor of a giant sugaro, a cereus aethiops or even a c. hildmanniansus v. montrosa 10 feet tall that only a mother could love ......
If you wind small Christmas light strings around the columns, the heat from the light will raise the temperature enough to protect these tall succulents from being scarred by cold. I didn't make this up. Searching for something positive to do about a 10 year old Key Lime growing in a pot which has shed its leaves in a fit of pique when the temperature dropped into the 30s recently, found this link to UC Davis.
This tree and I have a history, not all of which is good. For years it refused to bear, though it was surrounded by bearing tangerines, oranges and a grapefruit. Well, maybe it needs a hotspot? Moved onto a SW facing wall where it gets full afternoon sun. . Ah--that was it. The Key Lime flowered, and bore limes. Not enough limes for a favorite recipe for Key Lime Pie which calls for 6 eggs and a lot of lime juice, but 3 limes, a first. Now this.
I turned to the authorities. http://anrcatalog.ucdavis.edu/pdf/8100.pdf If Christmas lights are good enough for UC Davis they ought to work on my surly Citrus aurantifolia.( He ---Limón mexicano is masculine---wants it known that he is out of his comfort zone and Limón mexicano and Key Lime are the same sour lime.) http://www.whfoods.com/genpage.php?tname=foodspice&dbid=27.
He's getting festooned, stay tuned.