Xu, a 28-year-old engineer from Jiangsu province, knew virtually nothing about edible wild plants before his 24-year-old girlfriend, who's from Guizhou province, suggested it.

The couple went on several spring excursions shortly after Spring Festival. They visited parks and fields throughout Shanghai's suburbs, waving mobile phones to use apps to identify plants' species.

They encountered many other people doing the same thing, especially families with kids and youth.

"There's only so much that people can do on a date. Foraging for wild vegetables is novel and interesting," Xu says.

"It's about exploring uncertainties together, while also getting fresh air and being outdoors."

It's advised to ensure foraging is allowed at the sites and to be careful when identifying plants to ensure they really are edible.

With spring soon drawing to a close, foragers are preparing for next year.

Huang's first experience inspired her to learn more about wild vegetables. She even started a WeChat group for fellow hobbyists. About 800 members joined to share experiences and tips and help foragers find partners to join their excursions.

"It's a good time," she says.

"It brings us closer to nature while providing seasonal veggies. It's meaningful and memorable, especially for people who are passionate about life and nature."