Image,

that makes alot of sense and is actually true. When the plant hermies unders stress it is natures way of trying to preserve the species, the plant thinks that its dying, therefore is considered a to be weaker in nature. Logic would say that if the plant takes the stress and does not hermie then it is a stronger plant and does not think that it is dying and can tolerate tougher growing conditions therefore becomes ideal breeding stock... Survival of the Fittest at its finest...