It is mold most likely, and eventually the bulb will begin to rot. If the bulb is still firm and hard, hold the bulb under running cold water and gently scrub it with something like a nylon pad or toothbrush. Leave the bulb above the gravel and let the roots form from the bulb into the gravel, or only bury the bottom portion of the bulb in the gravel, enough to keep the plant upright. If the bulb is soft or squishey at all, it is a lost cause. If after a few weeks roots never develop from the bulb, then most likely you do not have bright enough light, even if the plant is still growing. The plant is growing from nutrients stored in the bulb, but once that is depleted if roots have not formed it can not draw nutrients. |