I don't know exactly when. but what I'm sure is I can plant gumamela plant any time every year. good luck with that though.I think that container I just fine. I planted mine in a container smaller than that. but they are very healthy now. they will strive. don't worry.
Unlike other plants, the colder it is, the better when it comes to planting tulips in the spring. Bulbs should be planted six weeks before frost in the fall, but they can survive if root time is provided. ... If you have bulbs, you can plant them at any point in the winter, January or February, in hopes of a spring blossom.I don't know exactly when. but what I'm sure is I can plant gumamela plant any time every year. good luck with that though.