I am waiting for four plants from the german site too, going to put them on the allotment. All the books say the roots take at least a year to get established, and that seems to be true. I put down fuggles last year and it barely got a metre tall (I planted way too late though the garden was a building site til july). This year it sprouted a few weeks ago and it's already about 18 inches tall and looking strong! I have three other varieties in the garden but they're new this spring so not much of a peep from them, except I see a little mini shoot from the challenger poking its head up!
Keep us informed of the german varieties. we can compare notes. Where are you growing? Wall? pole?