May 20, 2021 That ’70s Show Two beautiful, showy cultivars introduced in the early 1970s: a tetraploid and a polyploid. Iris siberica “Silver Edge” – McEwen, 1972 Paeonia lactifolia “Top Hat” – Reynolds, 1971 Paeonia lactifolia “Top Hat” Share this:EmailFacebookLinkedInLike this:Like Loading... Related