I mentioned seed companies yesterday and it occurred to me that I should probably mention them. They are, of course, just my personal preferences but I have had good success with them. And their catalogues are very informative about each general variety.
Victory Seeds, Territorial Seeds, and Johnny's Selected Seeds, for standard garden veggies.
For excellent Spring bulbs, I go to Brent and Becky's Bulbs. I've ordered from them for several years. This year I was amazed to discover that almost all the daffodil bulbs were doubles or even triples. They could have just snapped them all apart and sold them as singles, but they don't.
For standard, meadow and wildflowers, I go to Prairie Moon Nursery. They have assorted trays and collections which are reasonably-priced. And all the transplants arrive in good condition.
And oddly enough, Amazon has some decent tree saplings. Two years ago, I ordered 3 Sourwood trees, 2 Korean Dogwoods (immune to a disease American dogwoods suffer from), and a Wisteria bush (should get about 12' tall and blooms in Summer. All seem to be thriving.
Sourwood... Red leaves and clusters of yellow berries in Fall.
Korean Dogwood... Spring bloom.
Wisteria... Not the tree-climbing vine, but a tree-form. Usually white or purple flowers. They vary. Mine should bear purple in Summer. You have to check.