I planted 3 varieties over four weeks ago: Hallertau, Cascade, and Centennial. I purchased the Hallertau and Centennial from the same vendor which were bigger rhizomes than the Cascade. The Hallertau and Centennial emerged 2 weeks ago and are growing well, the Cascade has not appeared yet. Should I plant something else? The Cascade is in between the other plants so I don't want an empty space in case it never emerges. Too late to plant a fresh rhizome?