Iowa Code
Chapter 359A - FENCES
Section 359A.2 - Trimming and cutting back.

359A.2 Trimming and cutting back.
If said fence be hedge, the owner thereof shall trim or cut it back twice during each calendar year, the first time during the month of June and the last time during the month of September, to within five feet from the ground, unless such owners otherwise agree in writing to be filed with and recorded by the township clerk.
[C51, §900; R60, §1531; C73, §1494; C97, §2355; C24, 27, 31, 35, 39, §1830; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §113.2]
C93, §359A.2