You will note that the one I designate as L-2 is an extremely large nut, considerably larger than its seed parent which it somewhat resembles. L-8 is of somewhat similar type, but smaller. L-3 and L-6, on the other hand, are of entirely different type. Much smaller, they are smooth, thin-shelled and well filled, with kernels running 50% by weight and of high quality. They resemble their seed parent, Lancaster, not at all but in type are much nearer Bedford, their probable pollen parent.
Another one of these seedlings, L-7, resembles Caesar, its probable pollen parent, far more than it does its seed parent.
Some years ago I hand-pollenized several blossoms of Broadview, using pollen from my original Crath.
One of the seedlings from these hand-pollenized nuts resembles Crath much more than Broadview, the seed parent. I have it here as C x B 2.
Aside from the apparent profound influence of the pollen parent on the offspring, there is the unexplained fact at that with the exception of L-8, all these seedlings are later vegetating than the seed parents and any of the suspect pollen parents. Of the Lancaster seedlings L-2, L-3 and L-6 are fully as late as Franquette and Mayette, blooming well after the first of May. Inasmuch as there were no Persians producing pollen anywhere near that time I can only believe that these nuts were pollenized by the black walnut on which they were top-worked. I intend to plant some of these nuts, and expect to produce hybrids.
This brings up the enticing subject of breeding Persian walnuts adapted to one's own conditions. I have no suggestions to offer scientists, but offer the following for the benefit of amateurs like myself.
If your grounds are cluttered up with varieties, as are mine, ingratiate yourself to some friend who has an isolated young black walnut tree by volunteering to convert it to the production of Persian walnuts. Select two varieties whose characteristics you desire to blend and that will pollenize each other, and grow seedlings from the resulting nuts. You can check results in as little as four years by taking buds from the seedlings at two years and placing then on black walnut.
Creative work, this. You will get the thrill of your life—if you are that kind of a person—and may produce something well worth while.
Persian walnuts are self-pollenizing if pistillate and staminate blossoms occur at the same time, but such usually is not the case. Crath, Breslau, Caesar and King produce their pistillate blossoms some days before their staminate blossoms shed their pollen, while Payne, Lancaster, Broadview, Franquette and Mayette produce their blossoms in reverse order. Of all those I have tested only Bedford can be depended to produce both types of bloom simultaneously and certainly and fully pollenize itself.
It is enlightening to keep a record of the blossoming time of each variety relative to others, but dates should all be recorded for the same year. Warm, early spring induces early blooming; late, cool weather delays blossoming. By my records, Payne pistillates were receptive May 3 in 1935, April 28 in 1937 and March 31, in 1945, a variation of over a month. All varieties vary with the season, but the variation is greatest with the early varieties.