Maryland Code, Agriculture § 10-114

(a) If the referendum is supported and the assessment is levied and collected as provided, any person upon whom an annual assessment was levied and collected, if dissatisfied with the assessment may demand and receive from the treasurer of the certified agency a refund of the collected annual assessment.

(b) The demand for refund shall be made in writing within 30 days from the date of collection from the person.

(c) However, any person, qualified to vote in a referendum in which potatoes or peaches are the agricultural commodity, may seek a refund of an assessment, if he pays the assessment by the end of the assessment year in which the assessment was levied. The assessment year shall be determined by the certified agency representing the commodity.

(d) If any person, qualified to vote in a referendum in which potatoes or peaches are the agricultural commodity, fails to make any protest against the assessment and levy in writing, addressed to the certified agency representing the commodity concerned, within 30 days from the date the assessment becomes due and payable, and the certified agency concerned may institute judicial proceedings to enforce the collection of the assessment.