Ten of New Brunswick's 20 cannabis stores were closed Monday as the province grappled with marijuana shortages, not even three weeks after the product was made legal in Canada.

Cannabis NB, the Crown corporation in charge of selling cannabis, said it has only received a small fraction of the marijuana it ordered from producers.

"We had made an initial order of enough products to last us a few weeks, but we only received about 20 per cent of that," said spokesperson Marie-Andrée Bolduc.

"We're just playing a bit of catchup."

Bolduc said producers across the country were facing challenges to meet with Health Canada requirements in terms of packaging and other regulations, slowing down production.

In Quebec, for instance, province-run stores had to close three days a week to deal with shortages.

New Brunswick's store closures were expected to last from a few hours to a few days.

Marie-Andrée Bolduc said Cannabis NB has only received 20 per cent of the marijuana it ordered from producers. (CBC)

The online site also listed several products as out of stock, including pre-rolled joints, oils and some varieties of the dried product.

"We're receiving shipments today, tomorrow and this week," said Bolduc. "We'll be able to open up as soon as we have a variety of products available.

"This is not an ideal situation. However, the store closures are temporary. This is a brand new industry."

The locations closed as of Monday were: