Apparently June and July are good times to take hardwood cuttings to root.
Monday, October 4, 2010
Virginia Tech Pawpaw Seed Germination
Seed propagation is slow but not difficult, provided certain conditions are met. Collect seeds from soft ripe fruit. Macerate the fruit and float the pulp off in water. Seeds can be dipped in a 10 to 20 percent bleach solution to reduce bacteria and fungi problems; be sure to rinse seeds well after dipping. Pawpaw seeds should never be allowed to dry out or their germination ability will be lost. Once cleaned, store seeds in a zippertop bag with slightly moist sphagnum peat moss. Seeds have a dormant, immature embryo, and require stratification (time and cold) under refrigerated conditions (32° to 40°F) for 80 to 120 days before they will germinate. Refrigerated, moist seeds can be stored for up to a year or more. Following stratification, seeds should be sown in a well-aerated soil mix, with an optimum temperature of 75° to 85°F. Use tree pot containers 14 to 18 inches deep that will allow room for taproot formation (Figure 10). Seeds will germinate in two to three weeks, form a taproot, and then send up a shoot in two months. Freshly extracted seeds can be sown directly outdoors in seedbeds in the fall; expect germination to occur the following year in July or August. Fieldgrown seedlings should be dug or transferred to a pot or permanent site in the spring as plants come out of dormancy. All propagation and growing areas should be provided 70 percent to 80 percent shade cover.