I have two questions that I hope can be answered by someone in the group. 1. Where can I buy coir, the coconut fiber to use as an amendment to my potting mix. 2. I picked up some slag ( Black Beauty) and would like to use it to dress some potted tender bulbs that I place outdoors for the summer. I know it is basically pure iron, any down sides to using it like leaching poisons in to the soil.. Arnold