Apparently the wild forms are native to Mexico and South America, so none growing in Europe or the US. Also, it is one of the earliest domesticated plant families - cultivated beginning more than 8,000 years ago - so the domestic varieties overwhelmingly outnumber the wild ones. From https://en.wikipedia.org/wiki/Cucurbita

C. argyrosperma is not as widespread as the other species. The wild form C. a. subsp. sororia is found from Mexico to Nicaragua.

The origin of C. ficifolia is Latin America, most likely southern Mexico, Central America, or the Andes. It grows at elevations ranging from 1,000 to 3,000 meters (3,300 to 9,800 ft) in areas with heavy rainfall.

C. maxima originated in South America over 4,000 years ago, probably in Argentina and Uruguay.

C. moschata is native to Latin America, but the precise location of origin is uncertain. It has been present in Mexico, Belize, Guatemala, and Peru for 4,000–6,000 years and has spread to Bolivia, Ecuador, Panama, Puerto Rico, and Venezuela.

C. pepo is one of the oldest, if not the oldest, domesticated species with the oldest known locations being Oaxaca, Mexico, 8,000–10,000 years ago.
The domesticated forms of C. pepo have larger fruits than non-domesticated forms and seeds that are larger but fewer in number.

It might reduce dryness-related pain, or wash out any dust or eyelashes that were causing irritation. Unless you are sensitive to the preservatives, saline solution would do the same and be more convenient. They have single-use saline packets for people with preservative sensitivity, but those are kind of pricey, so I can see the case for boiled water.

People get weird ideas and can be stubborn about them. My father spent more than a week using Clear Eyes in an attempt to moisturize. (Clear Eyes is a product to reduce red appearance, is not meant to improve eye comfort, and causes rebound irritation as the blood vessel constrictor wears off.) It took multiple talks after his eye irritation was only getting worse to convince him to switch to the actually moisturizing drops the eye doctor had given him.