Since Jan. 1, 2019, dozens of retailers across Massachusetts combined to surpass $420 million in sales, with marijuana flower purchases being the most popular by a wide margin, statistics showed.

Prior to Christmas, marijuana sales in the month of December alone had topped $10.7 million.

Marijuana sales in Massachusetts include a 6.25 percent sales tax, a 10.75 percent excise tax, and a local option for towns and cities to implement an additional 3 percent tax.

All licensed adult-use marijuana establishments must register and trace their products in the Commonwealth’s seed-to-sale tracking system.