Does anyone here have experience with the Humboldt Sunrise rhododendron? I purchased two of these along with a Nancy Evans, Horizon Monarch, and Seaview Sunset. All of these are thriving in containers with filtered orchid bark, but the two Humboldt Sunrise look like they have not taken off yet. The leaf structure on Humboldt Sunrise looks more like a mint leaf than a rhododendron. I suspect this plant wants very specific growing conditions and I don't know what those are yet.