Moss roses, also know as Portulaca are succulents, so they are excellent flowers to have if you live in a dry climate, since they can store water well, and also provide lots of low lying color for your garden.They also are very easy to take care of after you get started.d. 2. Plan out where you will put your moss roses. Depending on what variety you purchased, space your plants as the variety needs, which should be 6–8 inches (15.2–20.3 cm). It may seem like a lot of distance at the time, however these plants grow fast and you will be thankful for planning ahead later.