Any person, firm, or corporation, acting either as principal or agent, violating any provisions of the preceding section¹ shall be deemed guilty of a misdemeanor, and upon conviction shall be fined in a sum not less than Fifty Dollars ($50.00) nor more than Five Hundred Dollars ($500.00) or by imprisonment in the county jail for not less than twenty (20) days nor more than six (6) months, or by both fine and imprisonment: Provided, that prosecutions under said section may be commenced at any time within seven (7) years from the time of the delivery to the purchaser of the fruit trees, plants or shrubs therein mentioned.