The germination percentages are based upon lots of 100 nuts except in a few species in which only 50 nuts were used. Differences in the percentage of germination obtained from various plantings of the same species are slight in most species. Even the larger differences in germination obtained in a few species cannot be considered significant but probably indicate variations in the quality of the original lots used. Summary Walnuts husked soon after harvest, before they are completely air-dried, and stored in moist peat at 1 to 3 deg. C. for five to six months have their dormancy broken and remain viable for at least three months thereafter. This treatment is effective for all ten species tested. It is probably effective for all species of _Juglans_. This method of handling the nuts has the advantage over outdoor stratifying or autumn planting which often result in much damage or loss of nuts from the activities of rodents. Table 1. Germination of nuts of _Juglans_ spp. after stratifying in peat over winter, at 1-3 deg.C. ------------------------------------------------------------------------ Per cent germination ------------------------------------- |Date |Planted in| |Planted Kind Source |entered|soil in |Planted |in |in |greenhouse|in field|sphagnum |storage|April 15 |April 24|June 2 -----------------------------------+-------+----------+--------+-------- nigra (Cornell) Ithaca, N.Y. |Oct. 1 | 70 | 80 | 68 nigra (Cayuga) Ithaca, N.Y. |Oct. 1 | 100 | -- | 80 cinerea--Ithaca, N.Y. |Oct. 1 | 60 | 44 | 8 regia (Sorrentina) Chico, Calif. |Nov. 9 | 66 | 48 | 8 regia (Franquette) Chico, Calif. |Nov. 9 | 80 | 36 | -- regia--Chico, Calif. |Nov. 9 | 75 | 46 | -- Sieboldiana--Ithaca, N.Y. |Oct. 1 | 100 | 40 | -- honorei--Chico, Calif. |Dec. 18| 60 | 55 | 46 pyriformis--Riverside, Calif. |Nov. 9 | 10 | 54 | 31 rupestris--Alpine, Texas |Oct. 1 | 40 | 83 | 50 major--Riverside, Calif. |Nov. 9 | 90 | 92 | 66 californica--Pomona, Calif. |Nov. 9 | 62 | 84 | 91 californica quercina--Chico, Calif.|Dec. 18| -- | 18 | 25 hindsii--Riverside, Calif. |Nov. 9 | 50 | 56 | 52 ------------------------------------------------------------------------ References-- 1. Brown, Babette I. Injurious Influence of Bark of Black Walnut Roots on Seedlings of Tomato and Alfalfa. Northern Nut Growers Association, 1942: 97-101. 1943. 2. Barton, Lela V. Seedling Production in _Carya ovata_. _Juglans cinerea_ and _Juglans nigra_. Contr. Boyce Thompson Inst. 8: (1) 1-5. 1936