SunDome, Multi-Vented Humidity Dome 7.5" - Case of 25Case of 25 The SunDome 7. 5" humidity dome is ideal for rooting large cuttings and or growing cuttings to large size after rooting. But it is also useful for seed germination, early seedling growth, and propagating smaller cuttings. It allows the grower to adjust the humidity levels to best suit the stage of growth using its four adjustable vents. The clear, high quality BPA free food grade plastic makes it easy to see the plants and observe their