TBMan said:two acres of Walla Walla silt loam (soil type - Haploxerolls) -- a type of soil found in the Columbia basin and the Palouse of SE Washington state. It grows good iris, fairly dense in structure, well drained, naturally alkaline in nature, and has a high mineral content, as well as higher phosphate and potassium levels and some residual organic material from eons of grassland occupation
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