How can I grow a poinsettia tree like the one in the picture.
You can’t use an entire Poinsettia Plant that you currently have to make a Poinsettia Tree because it has several stems and a Poinsettia Tree has only one stem/trunk. Here are some instructions how you can grow a Poinsettia Tree.
1. Take about a 5″-6″ stem cutting from a poinsettia plant leaving a few leaves on the stem and root it in some good potting soil. keep the cutting in medium light.
2. Once the poinsettia has rooted move it to bright indirect lightVery few houseplants should be placed in direct sun. High light refers only to bright indirect light since direct sun often burns the leaves of indoor houseplants. An area that is too hot and dry encourages Spider Mites and causes blooms to quickly fade. A northern exposure really doesn't provide enough light for high light plants. These plants need to be placed directly in front of an east-facing window, within 1-3 feet of a west-facing window, and within 5 ft. of a south facing window. A high light area has over 300 ft. candles of light..
3. As the plant grows keep removing any side shoots or stems but leave the main stem alone.
4. Once the plant is as tall as you want, start allowing the the side stems that develop along the top 1/3 of the stem to remain. Pinch back these side stems often so that the canopy of colorful flowers (really bracts) will be full and bushy. Stop all pruning by November.