For greeting cards, you will need to supply full spreads of the outside (and optionally inside) of the card.
For example, let's say you are making a 5x7 Greeting Card. When laid flat, that would be 10x7 – So you would need to supply an image that is 10x7, not 5x7.
The easiest way to make sure you have laid out your card correctly is by doing what we do: Take a piece of paper, fold it in half and then write "front," "back," and "inside" on it. Then unfold it and use it as a rough guide so you don't get confused.
Remember, if you are doing full bleed, you need to add 0.25" to each dimension. For instance, a 5x7 greeting card would use an image that is 10.25x7.25.