I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
A reel long or will work fine on St. Augustine grass. When you purchase the more asked for one that is designed for a coarse textured grassed such as St. Augustine. Real mowers come in various types with different numbers of blades and are designed for slightly different mowing heights.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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