A plantation of pines or other conifers that is used for research or for amenity purposes, similar to an arboretum. Found on http://www.encyclo.co.uk/local/21605
Pi·ne'tum noun [ Latin , a pine grove.] A plantation of pine trees; esp., a collection of living pine trees made for ornamental or scientific purposes. Found on http://www.encyclo.co.uk/webster/P/90