I am in zone 9a which descriptions say they may survive. I have two pagodas, two cashmere bouquets, a starburst. I I'm looking at getting two butterfly bushes. The prices seem high with small plants so I am not sure it would survive the winter. All mine are in pots. What techniques can I use to protect the plants that work? There are maybe ten freezing days a season in winter with some reaching mid 20s.
