Currently (March 2019), the collection comprises 408 accessions of S. oleracea, 75 of S. turkestanica and 19 of S. tetrandra, all belonging to the primary gene pool of cultivated spinach. With respect to population type, the collection consists of 145 cultivars, 125 landraces, 91 samples of wild/weedy populations and 141 unspecified accessions.

The majority of accessions of cultivated spinach originate from Europe and Asia. The accessions of S. turkestanica mainly were collected during an expedition in Tajikistan and Uzbekistan in 2008, and those of S. tetrandra during an expedition in Azerbaijan and Armenia in 2011. For S. tetrandra the first samples of the expedition have been made available for distribution, while a total of 20 other samples will follow in 2019 and 2020. CGN is currently working on extension of the collection with a selection of modern varieties.