Q.rose bushes
I have a rose bush which I planted about a month ago. Only one branch is green and the others look dead. What have I done wrong

It is likely not you that did anything wrong. Sometimes the bud and bloom rosebushes in the pots are somewhat rootbound and never really come out of that and just die. Some roses are sold in those plastic bags at various stores. I call them Body Bag roses as the root systems have typically been cut back badly. While in the bag and wet they do fine and look quite healthy. But take them out of the bag and plant them in the ground and the entire situation changes big time! The root systems are so badly cut back that they cannot begin to support all the upper growth. So they die. I try one once in a while as a challenge to see if I can keep it going. My success rate has been about 25% and that is with a lot of babying. I also water all my rosebushes in with water that has both a product called Super Thrive and a root stimulator in it. Water with the same type mix the next 5 to 6 times they need watering. It helps them overcome any transplant shock and get the root system growing well. Happy root system spells happy top side!