Orchids MAY produce keikis due to stress. If a plant is in very poor shape, it may produce keikis as a 'last ditch' effort to reproduce. But, many orchids are just prone to keikis (some Phals, many Dens and Epis) . Dens that require a winter rest in order to bloom will produce keikis instead of blooms if they don't get the winter rest (another way to reproduce). If plant is in good health, keikis are not a symptom of stress.
But I don't feel they are an ultimate prize either ... like I said, many orchids can be keiki machines, and you don't even want the keikis anymore pretty quickly.
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