First, you must have the correct sex. Male plants don't have showy flowers, but since generally only the female are sold in stores, you probably have female plants. This article has several points you can consider in figuring out how to encourage your plant to flower: https://www.gardeningknowhow.com/ornamental/foliage/ornamental-grass/no-plumes-on-ornamental-grass.htm
Answered on September 8, 2014
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