Water condensation left unchecked can rot the bud primordia. Autumn's more pronounced temperature fluctuation can lead to water condensation inside the sheath, hastening the normal process of senescence, so yellowing sheaths can be left on the plant only so long before they must be carefully removed to preserve the bud primordia within. (Early sheath development does not mean early flowering on plants with winter-spring seasons.) You may notice that some of these sheaths are showing signs of yellowing. In some cases, these sheaths will have been evident since as early as July. Many of these ripening growths will have a sheath, presaging the coming winter or spring flowering season. Growths, made during summer's heat, and relatively soft and green, will be ripening - hardening - in preparation for a brief period of rest (in many cases). Feed less frequently and at lower dosage, but feed. Note that the key word is reduced, not eliminated. Reduced water needs signal a reduced need for fertilization. This is a function of both the reduced day length and lower temperatures, as well as the plants' slowing growth rate. The first cultural change noticed should be a reduced frequency of watering, as the plants dry out more slowly. Plants are responding by slowing and ripening their growth in preparation for winter.
Days are becoming shorter, hence cooler the sunlight has less intensity as a result of the sun's lowering angle, nights are longer and generally cooler. Growers of just about every level of expertise will have begun to notice autumn conditions by now. Monthly Checklist for November and December Cattleya
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