[Wikipedia] Origin & invasiveness: Ipomoea indica has become a noxious weed and invasive plant species in Australia, California, China, Ethiopia, France, Greece, Italy, Kenya, Mexico, Montenegro,[14] New Caledonia,[15] New Zealand, Portugal,[16] South Africa, Tanzania, and Uganda. In New Zealand, it is classed as an unwanted organism under the Biosecurity Act 1993 and it is therefore illegal to sell, propagate and distribute the plant.[17] It is listed on the National Pest Plant Accord for New Zealand. When growing in optimal conditions, the plant is able to spread via seeds, stolons, and stem fragments. I. indica is capable of producing a very large amounts of seeds for dispersal. These seeds are easily germinated, giving the plant the ability to rapidly invade and colonize new land. It can grow over pre-existing trees, shrubs, and other plant species. I. indica successfully outcompetes many native plants for substrates, nutrients, sunlight and water. The stolons of blue morning glory create a thick mat over ground plants, reducing the light available for those plants. The stolons of blue morning glory are also capable of growing at a rapid pace, adding to the plant's succession.[7] Each part can grow as a separate plant if snapped during the process of attempted removal. The only natural enemy of I. indica is the oomycete plant Albugo ipomoeae-panduratae, which have shown instances of infecting the plant. Its lack of natural enemies is another reason I. indica is very successful and adds to its invasive abilities. (link added by Mary Ann Machi)