Aperol spritzes, overalls, and the return of perms: Here were the biggest trends of 2018, according to Square

The hairstyle popularized in the '80s is making a comeback, with perm hair services up 77% in 2018.

Plant-loving millennials are creating a succulent boom. Sales of the trendy plant increased 80%.

Read more: Millennials are obsessed with raising plants, and one New York-based startup is poised to capitalize

The condiment, made from ground sesame seeds, saw sales increase by 90% in 2018.

Sales of braid hair services increased 96% over the last year.

The influence of Starbucks' Unicorn Frappuccino is far from over. In 2018, sales of anything unicorn related were up 110%.

Read more: The Unicorn Frappuccino completely revolutionized how Starbucks invents new drinks

Sales of enamel pins skyrocketed 210% in 2018.

As rose gold took over tech, sales of the classy color increased 235%.

Read more: Amex is issuing a limited-edition rose gold version of its brand-new Gold Card — here’s how to request one in 5 minutes

Sales of overalls increased 330% over the last year.

Oat milk was the vegan dairy replacement to beat in 2018, with sales up 425%.

The drink snagged the No. 1 spot on this list, with sales up 515%.