An optimization study on concentration (viz. 0.01, 0.1, and 1.0 g L-1) and dipping time (i.e., 30 and 60 min) was conducted on three different color morphotypes (i.e., reddish brown, yellowish brown and purple) of the commercial carrageenophyte (Doty) Doty. The study tested the efficacy of Acadian Marine Plant Extract Powder (AMPEP) on the growth rate and occurrence of macro-epiphytes from August to November, representing the wet season of the Philippines. The optimum concentration and dipping time were obtained at 0.1 g L-1 and 30 min, respectively. These optimum parameters were then further verified in a commercial nursery using the yellowish brown morphotype. In another experiment, ( purple morphotype) and (Schmitz) Doty ( green morphotype) with, and without, AMPEP dippings were tested for their total phenolic content, free radical scavenging and iron chelating activities. Seaweed dipped in AMPEP demonstrated higher growth rates than the control. Lower concentrations (i.e., 0.01-0.1 g L-1) and shorter dipping time (e.g., 30 min) produced higher growth rates than the highest concentration (1.0 g L-1) and longer (60 min) dipping time. The presence of macro-epiphytes such as filamentous did not adversely affect the robust growth of the three color morphotypes of . The lowest and highest growth rates obtained in a commercial seaweed nursery using the optimum concentration and dipping time of AMPEP were observed in July and January with 0.8% and 6.7% day(-1), respectively. The antioxidant content of ( purple) and ( green) responded differently to AMPEP dipping. The changes in total antioxidant activity followed almost the same trend as in phenolic content, in both ( purple) and ( green), whereas, the iron chelating ability of both seaweeds with and without AMPEP dipping varied monthly. The results obtained for the use of AMPEP dips for commercial cultivation demonstrated an effective management tool for improved farming protocols.