Does this planter have drainage holes?

The listing does not mention drainage holes. If you plant directly in it, drill or add holes, or keep the plant in a nursery pot inside it.

What size plant fits a 5-inch planter?

It suits plants with root balls around 4 to 4.5 inches across, such as small succulents, herbs and 4-inch nursery pots. Larger plants will outgrow it quickly.

Can I use it outdoors?

It is plastic, so it handles moisture, but it is not described as UV-stable or frost-proof. Keep it on a porch or indoors if you want the mint color to last.

Is it sold in other colors or sizes?

Only the 5-inch mint green version is shown here. Check At Home for other Saturn colors and sizes if you want a matching set.

Is this planter good value?

It is a low-cost decorative 5-inch pot. Compare it with ceramic or glazed pots of the same size: it wins on weight and color choice, but loses on drainage and a premium look.