"3. Among those studied, Black Republican, Black Tartarian, and Waterhouse seem to be the most efficient pollenizers for this group of varieties. "4. Other good pollenizers that may be mentioned are: Elton, Wood, Coe, Major Francis, Early Purple. These, however, proved somewhat variable in their pollenizing abilities. "5. _Some_ of the seedling trees found in and about cherry orchards are efficient pollenizers for the three varieties--Bing, Lambert, Napoleon. Probably _many_ of these seedling trees are efficient pollenizers, though the value of any particular seedling can be determined only by experiment or very careful observation. "6. At least some members of the Duke group of cherries are capable of pollinating some of the Bigarreaus. "7. At least some of the varieties of the Sour Cherry (P. cerasus) are capable of pollinating some of the Bigarreaus. "8. Inter-sterility of Sweet Cherry varieties is apparently not correlated with their closeness of relationship. "9. The ability of a variety of cherry to set fruit is not entirely dependent upon the kind of pollen available. Environmental factors are important." It is doubtful if New York cherry-growers will need to pay much attention to cross-pollination but, in case cherry trees are not setting full crops, and for no other apparent reason, the fertility of the blossoms may well receive attention. Should varieties be found self-sterile, sorts must be chosen which come into blossom at the same time, in which case the preceding table shows the sorts which bloom together or nearly enough so to make cross-pollination possible. [54] Gardner, V. R. Pollination of the Sweet Cherry, _Ore. Sta. Bul_. =116=:36. 1913 CHERRY ORCHARDS AND THEIR CARE It is patent to the eye of every passer-by that cherry trees are commonly set too thickly in most of the orchards in New York. While close planting is a universal fault, the amount of room differs greatly in different cherry centers, depending mostly upon the custom in the community, though, as all confess, it should depend upon the variety and the soil. The very erroneous notion seems to have prevailed in setting the plantations now reaching maturity that a large return could be skimmed from a small area by close setting, Sour Cherries often being put only twelve feet apart each way and Sweet Cherries, considering their great size, even closer, at sixteen feet. Experienced growers now put such dwarf kinds as the Morellos at from sixteen to eighteen, the Montmorencies and their kind at eighteen to twenty-two; and the large growing Sweet Cherries at from twenty-four to thirty feet.