You'll definitely want to grow it wet. To accomplish that, I let most of my phrags sit in water at all times, but if you're uncomfortable with that, then you should be prepared to water it a lot. Possibly in the heat of the summer, it will need to be watered once or twice a day.
It should be able to handle heat pretty well, and should also be adaptable to winter temps in the 50's, though a little warmer would be much better.
In terms of light, this will grow pretty bright, and probably prefers a bit of morning sun. Though, if you have the right setup, it should be able to grow fine in artificial lighting. Due to the size of the plant, you probably won't be able to get away with growing it under fluorescent shop lights.
For a potting mix, due to the size of the plant, you'll want to use something big and chunky. Bark might be the best option, but you'll probably want to add in some sponge rock, lava rock, or large grade charcoal if you have access to it.
I grow all my phrags indoors under lights, so I don't have any of these really huge crosses, but I've grown them in the past. They can soak up a lot of water in the summer, and they take up a lot of space, especially when in bloom. If you start to see leaf tip die back, it can be an indication that the plant is getting too much fertilizer or that the water quality isn't quite up to its standards. You're best off using rain water, RO, DI or other very pure water sources and then mixing in a small amount (usually 1/8 to 1/4 label strength) fertilizer, and then periodically, flush the pot with pure water.
---------- Post added at 02:36 PM ---------- Previous post was at 02:30 PM ----------
Quote:
Originally Posted by Fairorchids
Most Phrags do best standing in water (I have gone from 3/4" to 1" to now closer to 2"). However, there are a few species, which reportedly do not do well with this treatment:
caudatum
sargentianum
longifolium
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Caudatum and its close relatives (popowii, warscewiczianum, etc) definitely grow better when kept evenly moist like a paph or phal versus sitting in water. They tend to rot very easily, especially in cooler temps and shorter days. Some of their hybrids can be finicky too when it comes to moisture.
Longifolium and sargentianum love water, though, and in most cases will appreciate sitting in water if you can't water them frequently.