NOVELTY - Method for treating vegetables, fruits and garden waste, involves (a) fermenting vegetables, fruits and garden waste, (b) mixing at least partially the above obtained fermented waste with compost, and (c) composting the obtained mixture, where the concentration of dry matter in the obtained mixture is at least 35 wt.%.    USE - The method is useful for treating vegetables, fruits and garden waste for producing products chosen from heat, water, compost and biogas, where the products are applied to green house (all claimed), and used in agricultural fields.    ADVANTAGE - The method produces compost cost-effectively with high quality, and is highly flexible, stable and environmentally-friendly. The vegetable, fruit and garden waste can be treated without generating digestate-derived wet fraction.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) method for composting vegetable, fruit and garden waste, involves (a) mixing at least partially fermented vegetable, fruit and garden waste with compost to obtain mixture having dry matter of at least 35 wt.%, and (b) composting the obtained mixture;    (2) method for providing greenhouse with carbon dioxide (CO2) and/or heat, involves (a) fermenting vegetable, fruit and garden waste to obtain biogas, (b) mixing compost and/or vegetable, fruit and garden waste with at least partially fermented waste such that a mixture is obtained having a dry matter of at least 35 wt.%, (c) composting the obtained mixture to obtain heat and compost, (d) separating CO2 from the biogas and optionally supplying the CO2 to a greenhouse, and (e) supplying heat produced in step (c) preferably to a greenhouse, in the form of water (30-60 degrees C); and    (3) waste treatment facility for the treatment of vegetable, fruit and garden waste, comprising a fermentor suitable for fermenting vegetable, fruit and garden waste into a digestate, unit for adding and optionally mixing compost and/or vegetable, fruit and garden waste to the digestate, and unit for composting the mixture of digestate and compost and/or vegetable, fruit and garden waste.