Hi Kittymoonbeam: Check out my most recent experiment. I made Sonia Rykiel, aka Mrs. droopy-neck, perky in my alkaline, limestone clay by putting sulfur plus gypsum (calcium sulfate) on the surface, then water it in.
Sulfur brings down my pH of 7.7, to release the potassium and phosphorus for blooming. Calcium in gypsum works with potassium for maximum osmotic pressure and rigidity of cell wall. Below is Sonia after a week of 90-80 degrees heat, full-sun:
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Sonia Rykiel likes gypsum and sulferin soil like mine, alkaline clay.
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