3 county-level rules, plus city-specific rules for 2 cities in St. Louis County, Missouri.
Verified from official government sources
Grass and weeds on residential property in unincorporated St. Louis County cannot exceed 8 inches in height. Property owners have 7 days after a violation notice to cut; non-compliance triggers county-contractor cutting billed back as a special tax bill.
St. Louis County Code Ch. 619 / §1110.302.4
In unincorporated St. Louis County, grass and weeds on residential property cannot be taller than eight (8) inches. If a violation notice is issued by St. Louis County for high grass/weeds, the property owner must cut the grass/weeds within seven (7) days of receiving the notice.
New trees may not be planted on a St. Louis County right-of-way between the sidewalk and the curb (SLCRO §1218.140). Existing right-of-way trees are owned by the adjacent property owner who is responsible for fallen-tree removal.
St. Louis County Code §1218.140
Sec. 1218.140. — New trees are not allowed to be planted on a St. Louis County right-of-way, between the sidewalk and the curb.
SLCRO §607.1005 permits residential backyard composting countywide if located ≥3 ft behind the main residential structure, screened from neighbors near property lines, and managed to prevent odors, rodents, and leachate runoff.
St. Louis County Code §607.1005
Sec. 607.1005. — Residents who compost organic materials must locate the composting at least three (3) feet behind the main residential structure and use accepted methods to prevent odors, the harborage of rodents and pests, and the discharge of leachate (liquid) onto neighboring properties. … Items prohibited in composting, include: meat scraps, bones, fatty foods (cheese, cooking oils, etc.),...
2 cities in St. Louis County have their own landscaping rules rules. Each link goes to that city's dedicated page with code citations.
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