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Stephen Head, president of Lone Star College-North Harris, asked me not long ago what the sparrow-size, aqua-blue birds were that had shown up in his yard. He wasn't the only one who wanted to know.

Stony Creek Colors is convincing farmers who used to grow tobacco to switch to indigo plants and selling the natural blue dye to fabric producers, including denim giant Cone Mills. The Goodlettsville, ...