Temps indicating OK to move plants outdoors
Is there a general rule of thumb for what temp range indicate when it is OK to move potted tropicals wintering indoors outside for the spring?
Overnight temps have been stay ing in the 40's but I'm unclear about what is too cold.
Examples of some of the plants I am wondering about are: non-hardy bananas, avocados, tropical hibiscus, citrus, plumeria. brugs... My zone 6 is about 20 minutes south of the PA border and locals figure last frost safety date is mid-May. I can lug plants back inside in case of frost...