Well, I equate the glass containers to: root rot for the orchid. The clear glass will heat up fast, and even with ONE drain hole at the bottom, it simply won't be enough! I, personnaly would NEVER put any of my orchids in clear glass containers, even with a bottom or side drain holes. Just my humble opinion...Betty :-) P.S. I use sulphur when I have to put something to seal a root cut...cinnamon will dry the root up and it will be unable to take up water.