Iowa Code § 317.25: Invasive plants prohibited — exception — penalty.

1. a. A person shall not import, sell, offer for sale, or distribute in this state in any form, including the seeds, any of the following plants:

(1) Teasel (Dipsacus) biennial.

(2) Multiflora rose (Rosa multiflora).

(3) Purple loosestrife (Lythrum salicaria).

(4) Purple loosestrife (Lythrum virgatum).

(5) Garlic mustard (Alliaria petiolata).

(6) Oriental bittersweet (Celastrus orbiculatus).

(7) Japanese knotweed (Fallopia japonica).

(8) Japanese hop (Humulus japonicus).

(9) Palmer amaranth (Amaranthus palmeri).

b. However, paragraph “a” does not prohibit the sale, offer for sale, or distribution of the multiflora rose (Rosa multiflora) used for understock for either cultivated roses or ornamental shrubs in gardens.

2. Any person violating subsection 1 commits a public offense and is subject to a fine not to exceed one hundred dollars.