When it comes to copying one plant in one picture and pasting it into another picture, that is the easiest part of the job. However, erasing the background from the picture you copied and transferred has to be perfect, or, cleaned up in order to show how clear and unique the photo looks.
In order to do this step by step, you must take two different photos of Hibiscus and open them up on Photoshop:
Use the rectangular marquee tool to copy the plant you want to transfer to the other photograph
In order to paste the plant onto the other picture, find a spot and use the rectangular marquee tool to place where the plant will go and click paste.
In order to enlarge or shrink the pasted photo, right click your mouse and select free transform. Move up and widen the image to enlarge or move the image down and close together to shrink
After you have pasted and feel ready to erase the background so that the flower can be intact and blend in with the photograph, select the eraser tool and begin erasing the edges of the plant and move around until the unnecessary background from the image is erased.
The hibiscus on the left was copied and pasted on Photoshop. Hence, why the plant, itself is smaller than the one on the right.