I have some emersed crypts in my paludarium (C. wendtii). They are basically growing in a muddy bog type condition.
A few points to consider:
- If the crypt(s) you want to grow emersed are obtained as a submersed specimen, it will take it a bit of time to recover from the transition...the aquatic leaves will dry up and die. I would actually recommend you cut all the submersed leaves off before planting for submersed growing.
- The wetter they are, the happier they are. Literally. They grow best when the roots are completely submerged and just the stems/leaves are emersed. Second to that, extremely muddy soil with water almost at the same level is best. The dryer the soil, the worse they grow. Finally, make sure the soil is not rocky/gravelly, or compacted. Crypts spread by runners under the soil, and if they can't easily spread, the plant becomes somewhat stunted, in my experience
- 'Crypt rot' can happen on emersed plants as much as submersed ones. There are a lot of different reason/theories of what causes crypt rot, you can do some research if you want. Personally I have noticed that bruising or breaking the roots or lower stems will lead to part of the plant turning to mush
- The crypt will usually look far different emersed than submersed. Color and size will be the most noticeable changes
- In the right conditions they will flower, and I have found that when they flower, they really flower...tons and tons of spathes all over the place! It's pretty cool