The increasing environmental concerns about the use of peat as a non-renewable resource in growing
substrates has led to the search for alternative materials. The aim of the present work was to develop
a circular chain system model based on the “on farm” production of green compost in nursery from
residues of pruning of woody plants and of grass mowing to replace peat in the composition of potting
mixes. Composting process, carried out in a nursery located in Central Italy, was evaluated by the analysis
of the succession of microbial communities and monitoring of temperature. The potential of green nursery
compost in the replacement of different percentages of peat in potting mixes used for the cultivation of
olive pot-plants was assessed by the estimation of the nitrogen mineralization potential and the detection
of olive tree growth parameters. Results showed that initial mesophilic phase of composting occurred
within three weeks followed by the thermophilic phase, which lasted for about 26 weeks and then by
the second mesophilic phase. The potential of N mineralization varied with decreasing amount of peat
present in the substrate. Plants cultivated in mixes obtained with reduced percentage of peat showed a
regular development of growth parameters (plant height and stem diameter) during the whole cultivation
cycle. Our results show that the widespread production and use of this renewable resource can provide
the partial substitution of peat in potting mixes with the potential to consistently reduce the economic
and environmental costs of nursery industry.