Stem. A single stem has a single bloom. It may also have a cluster of flowers (that's also called as a spray) right at the top.
Bush. A group of greenery or flowers, a bush is a popular form as it looks great regardless of the type of space it's incorporated into. An arrangement can be of the same exact variety or mixed. The stems can also be separated or joined at the end/bottom.
Premade Arrangements. A large silk floral arrangement is always preferred by stylists as experts design the product themselves. It comes complete with a vase, swag, wreath, or basket. Before you buy large silk floral arrangements, make sure that you know what the authentic ones look like. You can look at images online or visit your local florist. Pay close attention to the leaves. Different flowers have different leaf shapes, textures, and veining. If you purchase a large silk floral arrangement from a reputable online seller, you will get a piece that has stems and leaves that look real.