Start your tubers that you want to do cuttings from in Feb. in the greenhouse. Take the cutting when it is about 3" tall- 2 or 3 sets of leaves. Leave about 1/8" of stem below the first set of leaves. Take off the first set of leaves. Dip the stem in rooting hormone to above the nodule where you took off the leaves. Poke a hole in the wet sand & put the cutting in the hole. Gently firm the sand up around the cutting.