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Many different vegetatively propagated cultivars of  Miscanthus sinensis  Anderss. are popular ornamental grasses sold at garden centers and nurseries. Large stands of the “wild type” or species (not ornamental cultivars) of this grass have self-seeded near Asheville, N.C.; Valley Forge, Pa.; and Washington, D.C. In order to document the competitive ability of this self-seeded naturalized species, a greenhouse competition study was conducted with  Panicum virgatum  L. `Forestburg' (P), switchgrass, and several non-native, naturalized biotypes of  Miscanthus sinensis  (M) grown from seed collected from the above locations. Seedlings were transplanted into #1 (2.88 L) containers in nine different planting arrangements: 2M; 4M; 8M; 2M2P; 4M4P; 8M8P; 2P; 4P; 8P, and grown for 15 weeks. Growth measurements were taken during the 15 weeks. At harvest, shoot and root dry weights were calculated.  Panicum  had significantly larger root (0.50 g vs. 6.00 g) and shoot (6.96 g vs. 2.3 g) biomass, respectively, than  Miscanthus . Intraspecific competition in monocultures was significantly higher for  Panicum  than  Miscanthus. Panicum  showed higher competitive ability than all  Miscanthus  biotypes, with one exception: root dry weights of one Pennsylvania biotype.  Panicum  increased in dry weight at the expense of  Miscanthus. Panicum  dominated  Miscanthus  during the 15 weeks and, in this study, proved to be a better competitor than  Miscanthus. Miscanthus  and  Panicum  did not fully share the common limiting resources and they showed partial resource complementarity.  Miscanthus  biotype variation was evident; the highest dry weights were from a Pennsylvania biotype and the smallest weights were from a Washington, D.C., biotype.

Miscanthus sinensis and Panicum virgatum Competition Study