Recommended planting density, and resulting tree spacing, for different types of black walnut planting stock. Planting Stock Type Trees per Acre Average Tree Spacing (ft ...

The genetics behind the alternating sexes of walnut trees have been revealed by biologists ... In this case, the two flowering types balance each other. If one flowering type becomes more common ...

UC Davis graduate student Jeffrey Groh has discovered how walnut trees are able to produce flowers of different sexes at different times ... In this case, the two flowering types balance each other.