I'd quarantine that pot unless you want it in your entire collection. Some U. subulata are cleistogamous and can set seed without even having their flowers open or being pollinated. It's a neat little plant but I wouldn't want to grow it for fear of it ending up in all my pots.
so awesome!!! your idea has been stolen lol.Today's project, 4x2 insulated cedar bog planter. Pond liner will arrive on Wednesday! PVC watering system with lava rock at the bottom. Will also have an over flow 1 inch below the soil line so it doesn't flood in heavy rains. Goal is to be able to mulch the top and leave it out through the Fraser valley winters!