Propagating by stem cuttings is just about the easiest way to make more begonias for next summer's garden. During the fall, I regularly trim off 3-node long cuttings and put them into the growing pots where they take root. Now that cold weather has arrived, I root the stem cuttings in a vase of water. It's a great way to produce more pots of Begonias for next summer's garden. Water the plant well the day before. Take a cutting about 4-inches long, with 3 nodes, from a healthy stem. Use a perfectly clean container. Rinse the container with a drop of bleach if you are uncertain about its spotlessness. Remove all but the top leaf or two. There should be no leaves in the water. The cutting should have a healthy leaf node at the bottom. Don't leave a stub below the node. Place the cutting into the water, and place the container out of the sun. In a couple of weeks, you will see new roots beginning to form. Check the water periodicall...
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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!