R. M. Kellogg Co., Kellogg's Great Crops of Strawberries…
“ Even with male varieties the crop may be increased and the quality of the berries improved if several bisexuals are set in the same patch as this provides an interchange of pollen which Nature intended.Strawberry varieties do not mix or become crossed through the runners. Everbearers may be set beside standard varieties, or any number of different varieties may be grown side by side in a garden or field without mixing unless the runners of one variety are allowed to spread and take root in a row of another variety. Prevent this by restricting runners of each variety to their respective rows. ”
