In Vermont, adults aged 21 and older are legally allowed to grow up to 2 mature cannabis plants and up to 4 immature plants.
(a) Possession and cultivation.
(1) No person shall knowingly and unlawfully possess more than one ounce of cannabis or more than five grams of hashish or cultivate more than two mature cannabis plants or four immature cannabis plants. A person who violates this subdivision shall be assessed a civil penalty as follows:
(A) not more than $100.00 for a first offense;
(B) not more than $200.00 for a second offense; and
(C) not more than $500.00 for a third or subsequent offense.
(2)(A) No person shall knowingly and unlawfully possess two ounces or more of cannabis or ten grams or more of hashish or more than three mature cannabis plants or six immature cannabis plants. For a first offense under this subdivision (2), a person shall be provided the opportunity to participate in the Court Diversion Program unless the prosecutor states on the record why a referral to the Court Diversion Program would not serve the ends of justice. A person convicted of a first offense under this subdivision shall be imprisoned not more than six months or fined not more than $500.00, or both.
UPDATE: Cultivation of 3 plants (and up to six immature plants) becomes a civil penalty starting on 1/1/21.
Cultivation of 11-25 plants is a felony punishable by a maximum sentence of 5 years imprisonment and a maximum fine of $100,000.
Cultivation of more than 25 plants is a felony punishable by a maximum sentence of 15 years imprisonment and a maximum fine of $500,000.
Source: 18 V.S.A. § 4230