Let us speak about Physan

[Intruder]

The Physan is not more available in Belgium but well in Germany. Having required near a German orchids producer if he could provide me some he answered me that he never used Physan because these slowed down the growth of the orchids. He has refers to an article published in the AOS review Orchids a few years ago. Have you see this article and what do you think about this assertion?
Many thanks for your comments.