Combine 3 parts seed compost with 1 part sharp sand to create a rich, well-draining starting mixture for the Clematis seeds. Moisten the mixture before filling the rooting pots. Fill several 4-inch pots with the mixture, leaving 1/2 inch of space at the top of each pot.
Sow one Clematis seed per square inch of surface area in each pot. Gently press the seed into the surface of the soil. Spread a 1/4-inch-thick layer of the compost and sand mixture on top of the seeds. Firm the soil.
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