Mr. Maher: I think the real test is to get them as near native to your place as you can. The area over which the white spruce grows is greater than that of any other spruce, possibly greater than any other evergreen, especially through the northern latitudes. I don't think there is any question about the Black Hills spruce being the white spruce that was left there growing when the other timber was destroyed, if we can adopt that theory. The white spruce from seed from the Northwest, from the British Columbia countries especially, is perfectly hardy with you. It is perfectly hardy with us at Devils Lake, which is a very much more severe test, whereas the white spruce from its southern limits may not be hardy even here. I think the Black Hills spruce is perfectly hardy. The distance north and south relatively is not so important with reference to growing trees as to get them from too far in the humid district. The white spruce that I would be afraid of would be the seed from New England and from the farther east limits of its growth, where the conditions are so much more humid.
Mr. Kellogg: Do you find any trouble with too much protection for orchards?
Mr. Maher: Where the protection is too close to the orchards I think it is very bad. It destroys the air drainage—
Mr. Kellogg: That is why they are liable to blight.
Mr. Maher: And they blight also. The air drainage is interfered with, and you get blight, and you also smother the orchard. I don't know but what the apple and the Americana plum are about as hardy trees as we have anywhere. I don't make any attempt to protect them specially except from the south and west. I don't put any northern windbreak around any orchards I set out. Of course, we may lose a crop with a spring frost all right when northern protection might save it, but with us up in our country if we have a good spring frost it is usually heavy enough to catch them anyway.
Norway Poplar windbreak at Devil's Lake, N. D.
I have a question here: How long should a shelter-belt be cultivated? Now, that is a point on which I think too much emphasis is placed. If you set out your trees as Judge Moyer did his, close together, inside of a few years they will take care of themselves, they will form forest conditions very quickly, and cultivation is not necessary any more. Of course, if you set your trees a great distance apart where there is nothing to protect them from the burning sun, and the ground bakes and dries, then you must cultivate or mulch, but I think cultivation much better than mulching.
Another question: How many rows of trees make a good windbreak? My idea is that it takes twenty rows to make a good one—of deciduous trees, of course. Two or three rows of evergreens, planted not further than eight feet apart and with joints broken, probably makes as good a windbreak as the twenty rows of deciduous trees and take less ground.
Mr. Horton: Wouldn't you have an open space in those trees? You wouldn't put them all together?