Clematis stopped growing
Do you know what variety of clematis these are? Some types are dwarfs, reaching only several feet tall. Is it possible that these are one of the newer dwarf clematis? Another thought: clematis grow best when their roots are kept cool. By planting them in an above-ground window box, the root systems will be warmer than those grown in the ground. That may be enough stress on the plants to check their growth.
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