If you want blemish/black streak free leaves and regular blooms, if you want the plants to look and do better than when you bought them, then avoid buying zygo species and their hybrids. That is unless you have a cooler greenhouse and fans for wind circulation or you can replicate these conditions indoors. This advice seems harsh but it's my 2c worth after years of growing them, after propagating them from seed and consulting with commercial growers. I've had specimen sized plants become infected with fungus and die off - with the next door plant unaffected. I just found a tray of plants that had been standing in about 2 inches of water all Summer on my deck. All have green bulbs and new growth. Siblings treated "well" elsewhere are either dead or dying. It's unfortunate as zygos are my favourite orchid and can be spectacular when well grown.
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