Plant growth can vary greatly. For example, smooth bromegrass is at the 2 1/2-leaf growth stage in North Dakota's McLean County on April 20, 2017, and it is at the 3 1/2-leaf stage a day earlier in Grant County. (NDSU photos)

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Plant growth can vary greatly. For example, smooth bromegrass is at the 2 1/2-leaf growth stage in North Dakota's McLean County on April 20, 2017, and it is at the 3 1/2-leaf stage a day earlier in Grant County. (NDSU photos)