Mexipedium xerophyticum Care & Culture Growing the Mexican Slipper Orchid

In Orchids, Phragmipedium
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Orchid Species Name: Mexipedium xerophyticum

Care Group: Slipper Orchids

Overview: I split a flask of seedlings, purchased from Paph Paradise back in 2019, and have grown out 10 plants in a community pot since that time. For general context, care for Mexipedium is pretty much the same as Phragmipediums and Paphiopedilums. Avoid very dry roots (though they are much more tolerant of this than both phrags and paphs), and avoid extended dryness or prolonged wetness. Good regular waterings are important. I soaking my plants once a week—sitting the whole pot (up to the base of the plants) in a big bowl of water for 10 mins up to 2 or 3 hours, then I’ll drain them and put back under the lights. Light is moderate intensity (compared to most other orchids): 12h/day under 4x18w (48”) strips from The Orchid Hobbyist (which works out to about 18w/ square foot of coverage). This species comes from limestone habitats, so they seem to need a bit of calcium (and you should avoid acidic root conditions). My tap water is alkaline, so it works well, but if you have pure water (RO or rain), I would suggest adding oyster shells to the potting mix. Humidity is recommended to be high, but mine is terribly low—only 18-40%. Clearly, if you keep them hydrated, then they can tolerate low humidity. Other than that, slow and consistent wins the race…they don’t grow fast, but they’re steady if happy.

 

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Mexipedium xerophyticum Care

This species comes from a very extreme environment on exposed limestone rock cliffs. Given seasonal changes (the dry season), it seems they are well adapted to periods of drought. The leaves are hard, thick and are structurally adapted to hold water, much like a succulent cactus. Overall, I feel they are easy to grow, but they seem to require more light than most other paphs and/or phrags. If the leaves are are a bright chartreuse to yellow though, you may be giving them too much light or not enough fertilizer. Dark green leaves that are long may indicate insufficient light. Plants adapted to limestone areas may not have the same resilience to conditions that are acidic so if your growing this plant in sphagnum or pure bark, you may find it’s not as robust, or that it gets root rot easily.

Mexipedium plants in situ growing on limestone rock cliff
Photo by Eduardo A. Pérez García, from, The Rediscovery of Mexipedium xerophyticum

 

Mexipedium Orchid Care Tips – Caring for this species

Humidity: most claim the humidity should be over 75%rH. Mine are rarely over 40% and mostly averages about 35%.

Hydration & watering: follow sharp but consistent wet/dry cycles, watering at regular intervals while avoiding prolonged wetness or dryness. I would say your goal should be to water, have the pot and roots dry within 3-5 days, and then water again; repeating this wet/dry ebb and flow indefinitely.

Photo of Mexipedium being watered
Soaking in a bowl of water for ~1h)

 

Potting media: a chunky well-draining and airy potting mix is essential. My mix is 50% pumice, 25% bark (ideally Orchiata brand which is treated with lime), 20% perlite, and 5% sphagnum. I also use an additional thin top-layer of sphagnum moss to hold moisture near the base of the plants and the roots a bit longer after watering. I don’t think you need to follow this mix closely; you could likely go as much as 60% bark to 40% pumice and still get the desired results. What is important is a media that doesn’t compact and restrict airflow, but also holds some moisture for a localized environment around the roots.

Fertilizer/nutrients: same as for paphs and phrags – organic fertilizer is good at quarterly applications, along with biweekly (every 2 weeks) applications of soluble orchid fertilizer at 1/4 strength.

Light: Moderately bright; target 5-25% filtered sun equivalent.

Photo of my lights & setup; the mexipedium have been grown on either of the bottom two shelves

 

Growth Patterns & cycles: Mexipediums are highly seasonal with flowers coming through around the peak of summer (June/July). Growth is very similar to other slipper orchids and starts with vegetative growth followed by flowering.

 

 

Additional Resources & Links on Mexipedium Care & History

 

 

Mexipedium xerophyticum Photos

(In reverse chronological order)
Mexipedium xerophyticum Seed Pod (Sibling Cross)
Going to give growing them from seed a shot.


Freshly Deflasked & Potted Mexipedium

Mexipedium xerophyticum Flask, from Paph Paradise – June 2019