In Kansas Zone 6, Double Knock Out is somewhat smaller than Knock Out, but you must be growing them Texas style--BIG! My Double Knock Out and my neighbor's Knock Out do not get "hugh" -- although neither one is a smaller bush. Differences in temps and growing conditions, I guess. Kate

Potted roses may be transplanted in hot summer. Just water thoroughly. If you should disturb the root ball much, and the plants wilt, you may need to provide temporary shade for ten days. Ideally, daffodil time for bare roots and dogwood time for potted roses.

The web site says that White Out doesn't have the Black Spot resistance expected of the Knock Out series

Do you have large trees right behind it, looking at the plants on the ground behind it it looks almost like this is on the edge of some tall trees? I can also see something is shading the soil right behind. If you planted this close to large trees its possible the root system of the trees is taking all the water/nutrients from your soil. Are the roses shaded as well? You need to ensure the rose gets at least 6 hours of good sun during the day. I would continue with the fish fertilizer every two weeks, and make sure the rose bush gets plenty of water. The fish fertilizer should help green up the leaves, I used it on a camilia this spring that had light green leaves which was all wrong for the plant and the fish fertilizer used a few times helped green it up nicely.