I have been asked multiple times regarding if it is actually legal to grow your own herb. I am hoping to clarify this below. I have located the Mass law that allows the cultivation of cannabis. Here is the current standards
The minimum age to possess herb is 21
You can have no more than 12 plants on the premises
You can have no more than 6 plants flowering
You can gift up to 1 oz of your harvest
These are the basic rules. The bottom line is, you can grow herb in your home.
Here is the Mass general law if you would like to further research