Children's apparel retailer Pumpkin Patch has agreed to purchase the HBKGirl retail chain for an unspecified amount.

HBK Girl, owned by apparel group Hallenstein Glasson Holdings Ltd, sells clothing for the 8- to 14-year-old girls' market.

According to Pumpkin Patch CEO Maurice Prendergast, the acquisition was "opportunistic" but complemented the Auckland-based company's core business.

"We are very much into growing our business organically," Prendergast said.

He added that HBKGirl could be rebranded under the name of Pumpkin Patch's existing 'tween' apparel chain Urban Angel.

The company will retain HBKGirl's existing staff as part of the deal.