I'd like to replace 3 Blushing Knockout Roses that died over the winter. I guess it must have been too dry and cold. I've looked for other replacements, but can't find a better choice. (@ 3-4 feet tall and wide, pale pink, part sun to part shade, long blooming season, zone 5a/6b). But they're absolutely impossible to find locally and even difficult to find online, at least from places I'm familiar with. Does anyone know why these are being phased out?