Hi Barb
welcome to the forum
for us to give you the right advice can you please go into your UserCP at the top left of the page and Update your Profile with your Location.
as this will help us with understanding your growing conditions as we have members from all over the world with different growing conditions.
also are you talking about Phalaenopsis orchids
also I moved this thread into the Newbie Questions so all the members will be able to help you.