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Paper sludge is a fibrous material that may be suitable as a replacement for peat moss in potting media. The goal of this study was to compare the growth of potted `Iridon' mums ( Dendranthema  ×  grandiflora  Tzvelev.) grown in sludge-amended media against that of plants in two peat-based commercial mixes. Paper sludge from a newsprint mill was composted 6 weeks. Plants were grown in a European pot mum regime with three rooted cuttings planted in square 10-cm pots containing either a commercial mix or a sludge-amended medium [75% sludge: 15% perlite: 10% vermiculite; or 50% sludge: 33% peatmoss: 17% perlite (by volume)]. Plants were grown for 12 weeks and not disbudded before plant growth indices were determined. Mums grown in sludge-amended media appeared similar to those grown in the commercial mixes. Plants grown in either sludge-amended medium were slightly shorter (1.5 cm) and narrower (2.5 cm) than those grown in the commercial mixes. In addition, mums grown in sludge-amended media produced eight fewer flowers and 4 g less shoot dry weight (per pot) compared to plants in commercial mixes. Composted paper sludge appears to be suitable for production of `Iridon' pot mums, even though plants grown in this material grew slightly less than those in commercial media.

Evaluating Paper Sludge in Container Media Used for Mum Production