No. Hedges usually have straight sides and tops, and are made from rigid bushes to form a sort of barrier. Grass doesn't have those characteristics.
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SnarfIn that link you gave me, definition 2 says the following: any barrier or boundary: a hedge of stones.So, in terms of a boundary (that is, any boundary), if it can be stones, why can't it be tall grass? Heck, why can't it be bricks, for that matter, or cacti, or bars, or wires, etc.?As strange as it may seem, you can't just blindly trust the dictionaries