I've only grown an ornamental Perilla and that was years ago so don't have the personal knowledge that others in the thread do. When I tried to match the above to pictures of Shiso I didn't really get the teeth on the leaves to match with a picture, but maybe I just didn't find the right one. I agree with Daisy that the stems should be square. They could indeed be but it's not clear from the pictures. Does the flower colour vary? The pictures I found on Google were white with the green Shiso.
