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Ross, many of yours will be super plants when they're matured.Among the two year olds, the last pic looks like a mixed selection of coums including from the Pewter group.
Was the seed from AGS or SRGC? That would suggest that all the seed of C. coum from various sources, is lumped together before distributing. If the same applies to your seedlings of C. hederifolium, it would make selecting those for one's application, well worth while in order to get some of those super silver forms. Usually I gloss over those with a sort of mental "yeah yeah," and go on to something more exciting.