Beefsteak Begonia Every two years Beefsteak Begonias, Begonia erythrophylla, benefit from being pruned and propagated. This is a very easy plant to take care of and the worst you can do to it is to keep a water filled saucer under it. These plants enjoy being dry. In two years, the stems become long and move out over the edge of the pot, making the plant's mass too large for most environments. Ours live on the screened front porch in the summer which has a western exposure. In the cold months, they live under full spectrum lights in the living room. They flower their hears out in either location, adding delicate pink bouquets wherever they are growing. My original, single, leaf came from a leaf I plucked from an office dweller's plant that was 4 feet across and hung 3 feet down on those long stems. I grew that plant in a clear plastic to go box on moist vermiculite. The stem you'll prune is the leggy part that has dropped its leaves. Make 4 to 6 inch long
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We are only recently zone 7. NE Oklahoma was zone 6b until about 10 years ago when it heated up to 7a.
But we still have horrific ice storms, spring blizzards with 18-inch snowfall, etc.
I bet most of those plants are worth trying. Dr. Miller puts solid fences on the north side of his plants to protect them from north winds.
Keep me posted on what you try!