Look for exhibit sign.
Most rock gardens contain alpine and sub-alpine plants from the world's mountain ranges.
Rock crevices, craggy cliffs , moraines, loose scree and short alpine turf make for ideal growing conditions for these tiny plants with low watering needs. Evergreen, deciduous, bulbous or tuberous plants can be found in alpine rock gardens. They are all adapted to surviving in extreme growing conditions and most are small sized versions of plants found in more plant-friendly conditions. In conclusion to this, you may say that plants we grow in rock gardens are simply small, hardy plants that can handle growing in extreme temperatures and dryness. In Oklahoma growing some alpine plants could be a real problem.