Hi Betsy.
I see you live in zone 9 Texas. I agree with Paul, you would probably have to monitor the semps closely to make sure they didn't dehydrate. Can you show us a photo of the container you want to use?
I've seem semps grow in very tiny containers and do very well with proper care. They do need a winter dormancy. But you can mimic that in winter months by watering them with ice cubes.
