What causes tip burn on Cymbidium faberi?
1. The fertilizer concentration is too high, which specifically shows up as thick, short roots and severe hollowing of the roots under the old growths. Some orchid growers say, "But my fertilizer concentration isn't high!" Please see point two. 2. Not knowing how to water: many growers using granular potting medium are still influenced by the traditional idea of watering thoroughly only after the medium has dried out completely. As the fertilizer in the pot dries out, its concentration...
1. The fertilizer concentration is too high, which specifically shows up as thick, short roots and severe hollowing of the roots under the old growths. Some orchid growers say, "But my fertilizer concentration isn't high!" Please see point two.
2. Not knowing how to water: many growers using granular potting medium are still influenced by the traditional idea of watering thoroughly only after the medium has dried out completely. As the fertilizer in the pot dries out, its concentration becomes too high. At this point the fertilizer will reverse-osmose into the roots, causing "root poisoning."
A friendly reminder: orchids grown in granular potting medium mostly die of dryness, not of waterlogging. Roots damaged by dryness have a whitish epidermis, while roots killed by waterlogging have a blackish epidermis. No matter what potting medium you use, you must grasp this: dry but not parched, moist but not wet.
Secondary causes: the humidity of the growing environment is too low, or the plant was brought in from a place with high humidity and has not yet adapted.
A friendly reminder: 1. A little tip burn on Cymbidium faberi is quite normal. Cymbidium faberi has long leaves, and during metabolism some harmful substances are deposited at the leaf tips.
2. Haste makes waste. First get the roots in good condition, just as you would get a person's stomach in good condition, so that they can enjoy eating anything.
3. Excessive tip burn is a physiological disease, meaning the plant itself has a problem.