Check to see whether the soil is dry. The tree's root ball should be moist.
Trees are available from many sources.
Catalogs offer convenience and a broad selection, but you can't see the product, and trees sent by mail are often small. Local nurseries and home and garden centers are the best places to start looking as you can see what you're buying. Before purchasing a tree, examine the leaves, limbs and bark for insect damage or disease problems evidenced by cracks or splits. The tree's root ball should be moist, and the leaves shouldn't be drooping or yellowing. Pruning may help some, but the tree's basic shape will remain the same.