Paphiopedilum Rothschildianum ‘R’

The “King of Slipper Orchids,” Line-Bred for Excellence

Legendary Species. Award-Winning Bloodlines. A Collector’s Crown Jewel.

Paphiopedilum rothschildianum is the undisputed “King of Slipper Orchids,” and a cross designated as ’R’ x sib represents a carefully crafted pairing of two exceptional sibling plants from this legendary Bornean species. This is not a hybrid; it is a species cross designed to concentrate and enhance the most desirable traits; larger flowers, superior color, and impeccable form making it a trophy specimen for the dedicated grower.

Understanding the ‘x sib’ Designation

The term x sib stands for sibling cross. This means the cross is made between two different, but related, plants from the same parentage. It is a line-breeding strategy used to fix and improve specific characteristics. In practice, it ensures the offspring are the result of outcrossing (which promotes vigor) rather than selfing, while still focusing the genetic pool. Many commercial listings use x sib to denote a cross of two high-quality, named clones or selected seedlings.

A Species of Unmatched Pedigree

Paph. rothschildianum is endemic to the rainforests of Mount Kinabalu in Borneo at elevations of 600-1200m and is classified as Critically Endangered in the wild. It is a terrestrial or lithophytic plant, often forming large clumps of up to 60cm-long, strap-shaped leaves. The plant’s iconic flowers are an evolutionary masterpiece, with a lip (pouch) modified to trap and guide insects for pollination.

Flower Characteristics & ‘R’ Clone Potential

• Appearance: Stately and large, with flowers reaching 12-15cm in natural spread. The dorsal sepal and synsepal are ivory to golden-yellow, boldly striped with deep maroon to chestnut-brown veining.
• Petals: A defining feature—the petals are long, tapering, and held almost horizontally, measuring up to 14cm in length. They often exhibit fine hairs at the tips.
• Pouch: A golden pouch, heavily suffused with purple.
• ‘R’ Influence: While the specific ‘R’ clone’s details are not widely published, it is typically one of a select group of outstanding parents. Sibling crosses of top-tier plants, such as those named ‘Dark Angel’ (AM/AOS) or ‘Paradise Lost’ (AM/AOS), are renowned for producing offspring with extraordinary color saturation and shape. When crossed with its sibling, the ‘R’ clone aims to produce seedlings that reliably exhibit its finest qualities.

Cultivation & Care Requirements

Cultivating this species is a long-term commitment, but the reward is spectacular.

Light

Provide bright, indirect light (approximately 1,500-2,500 lux). It tolerates more light than many other Paphiopedilums but avoid direct midday sun, which will scorch the broad leaves.

Temperature

Prefers intermediate to warm conditions, with daytime temperatures of 22-26°C.

• Winter Rest: Protect from temperatures below 15°C.
• Night Drop: A cooler drop at night is beneficial for growth.

Watering

Keep the substrate consistently moist but never waterlogged. Use rainwater or demineralized water where possible. Water thoroughly when the medium is approaching dryness. Do not allow it to dry out completely for extended periods.

Humidity

Requires high humidity (70-85%) and good air circulation to thrive.

Potting Medium

Use a well-draining, terrestrial mix. For Paph. rothschildianum, a limestone-based mix is often recommended. A standard mix of fine to medium bark, perlite, charcoal, and a small amount of sphagnum moss works well. Repot every 1-2 years as the medium breaks down.

Fertilizer

Feed with a diluted, balanced orchid fertilizer (quarter to half strength) weekly during active growth. Flush the pot with plain water monthly to prevent salt buildup.

Growth & Blooming Timeline

• Maturity: This species is a slow grower. It can take 5-10 years from seed to reach flowering size.
• Inflorescence: An erect spike up to 75cm tall emerges from the center of the leaf fan.
• Flower Count: Mature plants can carry an impressive 2 to 4 (and sometimes up to 6) flowers per spike.
• Bloom Season: Typically flowers in spring and summer.

Perfect For

• Advanced Collectors seeking a legendary, award-potential species.
• Patient Growers willing to invest the time for a mature, show-quality specimen.
• Line-Breeding Enthusiasts interested in acquiring plants with elite, selected genetics.