I planted a Panache Tiger(four foot tall potted) back in October last year, and now it has only put on about 4 inches of new growth this spring, with about 1/4 to 1/2 inch between each leaf. It gets plenty of water and the soil is rich on that site--am I doing something wrong, or is this variety known to be a slow grower?

By contrast, my newly planted Violette De Bordeaux (potted rooted cutting) and Janice Seedless Kadota (in ground four feet tall from bareroot) have each put on about 12 inches of new growth, with about 1 inch or more between each leaf.

My well established Black Jack has put on 18" of new growth with prolly about 3 inches of space between each leaf.

In your experience, what varieties tend to be slower or faster growers?