If roses bushes were planted in large window boxes and pruned and put inside for the winter, what needs to be done now that we brought the planters back outside.
We fed and have been watering but nothing is happening.
What should we do?
If you want an indoor rose, go with miniature roses. KnockOuts are difficult to grow in containers. This shrub will have roots that extend at least 3 feet wide. You describe a "window box" that is large. That sounds too small but maybe I lack imagination. Bringing it indoors removes the trigger of cold weather that induces dormancy. Dormancy is followed in spring by a warm up that brings new growth. Did you keep it watered? Even when dormant, plants need some moisture to keep the roots from drying out. If you see no growth, slide the plant out of the pot. If the roots are dried out, the plant is dead. Also, in general, don't fertilize until new growth has started.