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Growth of two Sphagnum species, S. magellanicum Brid. and S. papillosum Lindb., was studied in the laboratory, field, and greenhouse in relation to photoperiod. Short days (less than 10 h light) induce both species into dormancy. Both species exhibit a high correlation of growth in length and biomass with photoperiod, having maximum length and biomass increase under continuous illumination. Likewise, the ability to lower pH increases with photoperiod. The greater increase in biomass of S. papillosum under 18-h photoperiods could provide short-term niche partitioning. Key words: Sphagnum, photoperiod, growth, pH-lowering ability.