Discussion after Graham, Smith, and Bernath Persian walnut papers.
Corsan: "Is using lime a good idea? I always use a lot of wood ashes."
Stoke: "Use ground agricultural limestone. Burned lime may cause injury."
J. R. Smith: "Barnyard manure is the best."
Stoke: "With the Carpathian walnuts there is no uniformity in winter injury. I have had the Crath variety kill back to two inch wood. Most others have never shown winter injury."
Corsan: "When is it practical to take mulch away?"
MacDaniels: "If you take mulch away too late you will get more injury than if you don't take it away at all."
Member: "Why does my young walnut tree not bear?"
Bernath: "English walnut trees may produce pistillate blooms for a number of years before they produce pollen so that if you have only one tree it may be due to lack of pollination."
Member: "With English walnut is more than one tree necessary for pollination? The male blossom appears a week or 10 days before the female."
Crane: "Persian walnuts should be used to pollinate Persian walnuts—do not depend on black walnuts. In growing Persian walnuts it is best to have trees of two or more varieties in a planting so as to provide cross pollination."
Stoke: "Persian walnuts may not pollinate black walnut, but black walnut has pollinated the Persian walnut in known instances."
MacDaniels: "Control or uncontrol of pollination is very complex."
Crane: "We find that we can not readily produce Persian x Eastern black hybrids under conditions of controlled pollination. We have found a number of natural hybrid trees but they bear very few nuts."