Young adults in China looking for a cheaper, low-maintenance alternative to having children or pets have found an answer: raising bricks.

Bricks may not be as cuddly as cats or as life-affirming as human offspring, but they also cost next to nothing. “No cats, no dating, I started raising a brick,” wrote one brick parent on social media.

Raising “brick babies” is easier than caring for house plants, involving spraying them with water a few times a day then waiting for moss spores already present in the atmosphere to attach themselves and grow. One Chinese media article described the bricks as being “practically immortal”. “If you forget to water them, the moss goes dormant. If you remember to water them again, the greenery returns.”

A hashtag related to the trend has attracted more than 5m views on the Chinese social media platform Weibo.

Social media users document their brick’s changes over a year, with hashtags including #healing and #stress relief.…