To reduce fungus growth, (1) try to let your plants dry out once or twice, (2) use a fungicide and (3) give your plants some space for more air flow.
When you get a day without rain, consider fertilizing your plants with a liquid fertilizer instead of watering. Give them a good drenching with 1/4 to 1/2 strength. If you use time-release fertilizer, it is still okay to use the liquid fertilizer, too.
Remember, this month is the time to stop fertilizing Nobile dendrobiums and many other dendrobiums that need a winter rest.
Also, this is your last chance to reset strap leaf vandas. You need at least three roots above the cut. Make sure you tie the plant down to the new vanda basket securely. Usually you need three months for the vanda to acclimatize to the new basket before the fall.
It’s always a good practice to clean any dead plant matter away from your plants. If you have weeds growing in your pots competing with your orchids pick them out. If you get them before they flower and spread seeds, it slows them down some.
Primary source: Dr. Martin Motes
