From the state ag dept list of plants prohibited from enrty into the state: Ipomoea spp. -- Morning glory. All species except Ipomoea carnea, Mexican bush morning glory; Ipomoea triloba, three-lobed morning glory (which is considered a restricted pest); and Ipomoea aborescens, morning glory tree,
Ipomoea triloba L. Three-lobed morning glory. The later is also listed as restricted if found, meaning "if found within the state shall be quarantined to prevent further infestation or contamination." I also found
Noxious Weeds For Sale
As each spring flower season approaches, weed dispersal can happen from businesses such as
grocery, drug, pet, hardware stores, and nurseries. Most gardeners do not think of nurseries or
gardening shops as sources of pest plants. Arizona Department of Agriculture inspectors find
prohibited weeds in retail seed displays and in display ponds each year. Often, non-native
species have no natural enemies in new environments and, if exotic species are aggressive, they
may become weedy invaders in their new habitats.
Non-native morning glory species invade and persist in Arizonas agricultural crop fields and
urban gardens. They grow so abundantly and are so competitive that their vines entangle, cover
and smother the crops and ornamental plants. In fact, morning glory infestations become so
dense that it becomes extremely difficult to harvest crops-an economic disaster for the farmer.
Therefore, these non-native morning glory species are prohibited in Arizona.
A non-native aquatic plant native to the
Amazon region of tropical South America, water
hyacinths have spread to tropical and subtropical areas worldwide. Water hyacinth plants,
another prohibited plant pest, form thick mats that are able to completely cover water surfaces.
Water hyacinth populations degrade aquatic habitats by reducing open water and displacing
native plants, create mosquito habitat, and obstruct waterways.
So it looks like the comments about cotton are probably more accurate than my previous understanding about canals, and binding weed is something different.