Trees for shade should be planted only after thoughtful selection, for those that may be very suitable in June may be less so in August. The Linden and the Mulberry are delightful trees when they come into leaf, but in July and August the former may make everything near by dirty with dripping honeydew, and in August and September falling Mulberries stain almost everything with which they come in contact.
Moreover, on a hot day in summer, people may not question the kind of tree that gives them shade, but when shade is unnecessary they become critical if some common and uninteresting subject is standing in a conspicuous position on a lawn.
Trees growing on lawns are not the only ones that have to be considered; the whole subject of trees for the sides of roads and streets must be taken into account, also field trees where shade and shelter are necessary for stock. Further, the trees that may be desirable for some locations and for some regions are undesirable for others.
Shade trees are also necessary for the successful cultivation of some kinds of plants. Many of the Rhododendrons, particularly those with large leaves, succeed better under the partial shade of Oak or Pine trees than when exposed to full sun. Ferns can also be more easily grown in moist ground beneath trees than in full sun, as well as certain kinds of Primulas, Liliums and other plants.
Shade Trees for Planting on Lawns. When a garden is not large enough to allow of the inclusion of a number of trees, the selection of one or two is of great importance. When making a choice, the planter should try to visualize the frees at maturity. A particular tree may be extellent when half-grown, but be quite out of place when full size.
Thus trees of the largest sizeRead more on backyardgardener.com