In cannabis cultivation, white tips are mostly regarded as less favorable than green tips. Green is associated with healthier plants and more appealing to consumers. However, research by Philips Horticulture LED Solutions over the past few years has resulted in surprising new insights. There appear to be two types of white tips, caused by different mechanisms. One of them correlates with higher THC/CBD levels. Fortunately, these ‘profitable’ white tips can be induced (or avoided) by specific light strategies.
Yes, there are two types of white tips in cannabis. The first type is known as photobleaching. It is induced by a mismatch between (high) light intensity and climate or irrigation conditions, causing stress. As a result, the green pigment (chlorophyl) in the top flowers starts to decay. Eventually, this so-called chlorophyl chlorosis makes the affected area look white. After re-establishing the light to climate balance, photobleaching will gradually disappear in the subsequent growth cycles.
In other words, photobleaching starts with a green plant, is a result of stress-induced chlorophyl chlorosis and will disappear after re-establishing the balance between light intensity and other growing conditions. Although light intensity plays a significant role, photobleaching is not related to specific light spectra.