06-01-2010, 10:29 PM
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Join Date: Mar 2009
Location: Lake Havasu AZ.
I don't know about using crushed corals, I think there would be problems with that. But crushed clay pots should be fine. I would try to break them up into about 1/2 inch sizes pieces, put them in some type of tumbler (to round the sharp edges that I could), then wash thoroughly to get rid of all the clay dust. You may need to adjust your watering schedule depending on how much moisture they retain. Low fired clay will hold more moisture than high fired clay will. High fired clay is more like dishes or tile and don't retain much moisture at all, but most planters/clay pots are low fired.
They usually line the inside of these pots with some type moisture barrier to keep them from soaking in too much moisture, but that wont be a problem when their all crushed up. You can also use most rocks, they don't hold moisture though, so you would need to water frequently. Also I understand that regular sand is commonly used with good results (for drip systems).