These are not cultivated, not planted nor cared for, nor useful to humans. In our part of the world, they are called wildflowers!
Tridax procumbens, commonly known as coat buttons or wild daisy in the Philippines, is a species of flowering plant in the daisy family. It flowers throughout the year and is commonly found in open places. The utility of these patches of vegetation is really commonly referred by us to be weeds. If the land will be used for crops, these are totally cut and discarded as first phase of land preparation.
It has no known folkloric medicinal use in the Philippines. However, in Indian traditional medicine, this is used as antifungal, anticoagulant, repellent, antidiarrheal, antidysenteric. The leaf juice is use on fresh wounds, to stop bleeding, and as hair tonic. n Nigeria, the Yoruba locals use the leaves for treatment to reduce blood pressure.
It is also known for several potential therapeutic activities like antiviral, anti oxidant antibiotic efficacies, wound healing activity, insecticidal and anti-inflammatory activity.
Tridax procumbens, is a declared noxious weed in many states of the US, but it is not declared invasive here in the Philippines maybe because it is just not written as is yet, but it really is very invasive. It is reported to have come from tropical America. Cattle —colloquially cows— doesn’t eat this but the butterflies and bees frequent them.