Muhlenbergia Capillaris...Muhly Grass~ also known as Cotton Candy Grass...Withstands heat, humidity, poor soil and even drought. Very easy to grow, it reaches a mature height of 3-4 feet tall and gets 3-4 feet wide.
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Allium giganteum is the tallest ornamental Allium in common cultivation
The Garden of Eaden: HOW TO GROW ALLIUM GIGANTEUM FROM SEED