This specific designation (f. semialba var gilbert rubra) represents a highly successful selection within the species, valued for producing exceptionally robust plants and flowers with a superior, high-contrast appearance. It is a prized collector’s item, showcasing the pinnacle of breeding success within the species.

• Light: Provide very bright, indirect light or filtered morning sun, similar to the light required by a standard Cattleya. Good light is absolutely essential for healthy growth and prolific flowering.
• Temperature: Intermediate to Warm. Maintain 70-85F (21-29C) during the day, with a significant nighttime drop of 10-15F (6-8C). This cooler night temperature helps encourage spike initiation.
• Humidity: Requires moderate to high humidity, ideally between 60-80%. Excellent air circulation is necessary to prevent fungal issues in these humid conditions.
• Watering: Water thoroughly when the growing medium begins to dry, but before it is completely dry. Reduce watering slightly during the winter months. Do not allow the pseudobulbs to shrivel.

Additional Notes

Features robust, club-shaped pseudobulbs topped with thick, leathery leaves. The plant produces large, impressive flowers, typically 4-5″ (10-12 cm) across, on an upright spike bearing 2 to 5 blooms. This particular horticultural form is highly valued for its dramatic, two-toned contrast and classic, full shape.