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For germination temperature: 20-25 Celsius. Germination time: 7-15 days Planting Instructions Start with a sterile potting mixture. Moisten it and spread it in a shallow container, then press the gloxinia seeds into the surface. They need light to germinate, so don't cover them,. To keep conditions humid, cover the container with a pane of glass or clear plastic. Then place the container in a shaded spot with temperatures consistently around 70 degrees. Seeds should germinate in two to three weeks at that temperature. At lower temperatures, germination will be slower.