I have 2 wilhlems, and I think it was the other one that did loose a few leaves to erwinia, but its hard to recall. The other one has put on 3 or so growths. This crazed one bloomed well this spring, with 2 flowers on the spike.
I use ST at 1/4tsp/gal, and readjust the pH to 7.2 with protekt.
The growth of some of these growths will undoubtedly slow, but I've been surprised how much they have taken off in the last week or so. Root growth is realy good right now too.
I was also about to say that you should check the roots....hopefully this is a sign of excellent health and growing conditions...but it worth checking to see if its pathological root conditions...Take care, Eric