Normal plants can self-pollinate but orchids need very specific insects or birds to spread their pollen. The process by which insects, the wind, or birds spread the pollen of different flowers is called pollination.  Pollen is produced by plants that contain their genetic material. 

https://steemitimages.com/DQmS4eujmbRUDCp4o4sX4WUdQZxSk8rR6D6M8M8SorUGUUF/image.png

In order for the plants to reproduce, the pollen must be removed to the flower’s stigma, where the egg lies. After that, the fertilized egg can become a seed. Birds and insects can pollinate plants by touching many different flowers and spreading the pollen around.