If you need some added humidity for your seeds and cuttings you have found the answer. The tall dome can increase rooting percentages in your cuttings and help your delicate seedlings get sprouted. Cuttings do not have a developed root structure and cannot take in any moisture. Keeping the humidity up in the cutting's environment will help the plants sustain moisture and will speed up the overall rooting process. These domes fit excellent on the 10" x 20" propagation trays.