White rhododendrons can indeed be considered rare in comparison to other colors of rhododendron flowers. While there are many varieties and cultivars of rhododendrons available in various colors, finding a pure white rhododendron can be a bit more challenging. However, it is important to note that the rarity of white rhododendrons may vary depending on the region and availability.
One of the reasons for the relative rarity of white rhododendrons is the genetic makeup of the plant. Rhododendrons are known for their vibrant and diverse flower colors, which are primarily determined by the presence and combination of pigments such as anthocyanins and carotenoids. These pigments contribute to the wide range of colors seen in rhododendron flowers, including shades of pink, purple, red, and yellow. However, the absence or reduced presence of these pigments results in white flowers.
The Rhododendron catawbiense Album is often regarded as one of the most reliable white varieties. It is a cultivar of the native Catawba rhododendron (Rhododendron catawbiense) and is known for its large, pure white flowers. This variety is valued for its hardiness and ability to thrive in a range of growing conditions, making it more readily available compared to some other white rhododendron cultivars.
In my personal experience as a gardener, I have found that white rhododendrons can be elusive to locate in local nurseries or garden centers. This may be due to the fact that other colors, such as pink or purple, are more popular and in higher demand. However, with some persistence and research, it is possible to find nurseries or online retailers specializing in rhododendrons that offer a selection of white varieties.
It is worth mentioning that while pure white rhododendrons are rare, there are also varieties that exhibit a white or near-white appearance with slight tints of other colors. For example, some white rhododendrons may have a subtle yellow or green undertone, giving them a creamy or pale appearance. These variations can add depth and interest to the flowers while still maintaining the overall white coloration.
To summarize, white rhododendrons can be considered rare compared to other colors of rhododendron flowers. The genetic makeup of the plant and the presence or absence of pigments contribute to the rarity of pure white varieties. However, with diligent searching and by exploring specialized nurseries or online retailers, it is possible to find white rhododendrons, with the Rhododendron catawbiense Album being one of the more reliable options.
