It is a hybrid heuchera so growing from seed will be unlikely to produce plants that are true to type.

FWIW, these plants are propagated exclusively asexually to preserve the exact characteristics of the mother plant. As this is a Terra Nova introduction, it has been propagated by tissue culture in a lab. It is also under patent, so home propagation......other than by seed.......is technically illegal. And as mentioned, growing from seeds will not get you the same plant :-)

You might just have to bite the bullet and buy more plants.

Oh wow I didn't realize that. I'm glad you explained that. I thought hybrid would still produce like it's parent.

Almost never. And many hybrids do not produce viable seeds anyway.