Owning a flower pot with water in it that isn’t capable of draining is considered a public nuisance.
Background information (if available):
Sec. 18-2. Weeds, trash, etc., as a public nuisance; removal by property owner or by city at owner’s expense; notice and hearing; lien for expenses.
(a) The existence of weeds, trash, undergrowth, brush, filth, garbage or other refuse on any lot, tract or parcel of land within the city which has caused the property to become, or which may reasonably cause the property to become infested, or inhabited by rodents, vermin or wild animals, or may furnish a breeding place for mosquitoes or threatens the public health, safety or welfare, or may reasonably cause disease or adversely affects and impairs the economic welfare of the adjacent property, is declared to constitute a public nuisance and is hereby prohibited.