Expert: nick mccann - 11/20/2008

Question
Hi Nick,
Here in the San Francisco Bay area we get nighttime temps in the low 30's for several days and so there is a possibility of freezing the succulents we have growing in boxes next to the house. We also have other non-succulents in pots similarly positioned. We learned there might be a sheet plastic material (with holes or mesh) to use as a frost covering but so far only can find a natural burlap in roll form (3' x 24'). Which would you suggest:keep looking for the plastic (any leads/names?) or go with the burlap, or?  We have used cotton clothing remnanats for many years with reasonable success so that is another possibility.
Thanks for your information.
Roland
Expert in Chrysler Repair Category at Allexperts

Answer
Hi Roland, The key here is to cover them allowing air between the cover and the plant itself; it is vital that when frost settles, it doesn't make contact through and touch the tissue of the sensitive plants. I would use whatever you have and build a small frame over them so they are in a tent type atmosphere, this will prevent the frost from contacting the plants, then during the warmth of the day,, just uncover them. I do this and find it works very well, and you don't have the risk of a heavy cover breaking leaves or stems. Another little trick is to set up a couple of floodlights that can be turned on at night and supply just enough heat to prevent frost from forming. Nick