[ Althea (Hibiscus syriacus 'Diana') | Posted on September 19, 2020 ] We have had this for many years. It is in tree form. It is in a very large pot so we keep it in our basement over the winter. It does extremely well. I have to cut it back every year. We also have several tropical hibiscuses, which of course are less hardy, so we have already taken them inside. Those stay in the heated part of the house, in a sunny window. We live in western Pennsylvania. |