Planting your Clematis This clematis planting guide is designed for planting a clematis that has been grown in a 2 litre pot or larger. Where to start First of all, you will need to dig a hole of approximately 15” (38cm) in diameter and about the same 15 inches in depth. After this, you will need to break up the soil that is at the bottom of the hole and mix compost with a small…