A producer may grow a crop conventionally on the same farm used to grow a certified product only if the crop grown conventionally is visually different from those crops grown organically. A producer shall use plant propagules produced according to the organic standards as provided in this subtitle. Seeds and Planting Stock. General Rule. To the extent feasible, a producer shall use organically produced seeds and planting stock, including: Bulbs; Plant material derived through tissue culture; and Tubers. Use of Untreated, Nonorganically Produced Materials. If the use of organically produced seeds and planting stock is not feasible, a producer may use the following untreated, nonorganically produced materials to produce an organic crop: Bulbs; Plant material derived through tissue culture; Tubers; and Seeds, except those used for sprouts. Use of Treated, Nonorganically Produced Materials. Except as provided in §C(3)(b) of this regulation, a producer may not use treated, nonorganically produced materials to produce an organic crop. For each of the following limited reasons, a producer may use treated, nonorganically produced bulbs, crowns, seeds, shoots, slips, tissue culture plants, and tubers to produce an organic crop: Treatments limited to fungicides; Commercial unavailability of untreated seeds or other organically produced planting stock of the same variety, and documentation of the producer's efforts to source untreated seeds or planting stock; Use of treated seeds, as required by phytosanitary regulations, necessary to prevent endemic diseases; or An unanticipated or emergency circumstance that makes it infeasible to obtain untreated seeds or other planting stock. Annual Seedlings and Transplants. Unless organic seedlings or planting stock have been destroyed by a natural disaster or other unanticipated circumstance, a producer shall organically produce annual seedlings and transplants. Perennial Crops. For perennial crops, a producer may use nonorganically produced planting stock to produce a crop which may be sold, labeled, or represented as organically produced only if the planting stock has been maintained under a system of organic management on a certified organic farm for a period of not less than 1 year. Prohibited Sources of Planting Stock. Except in cases of emergency, if transplants are destroyed by frost, flood, or other natural disaster, a producer is prohibited from using annual transplants that have not been produced according to the standards set forth in this regulation. In cases of emergency, a producer shall notify the Department immediately regarding an emergency and submit the notification in writing within 7 days. The Department shall verify the emergency conditions and determine a maximum length of time during which the organic producer may use annual transplants that have not been produced according to these standards. A producer may not use genetically engineered seeds, seedlings, and planting stock.