Dendrobium nobile - Brown and yellow Leaves
Hello, I am a complete newbie to orchids. I started with some basic phalaenopsis about half a year ago and they are doing great. Then a few months ago I thought to expand and acquired a dendrobium nobile. Things were great and the plant bloomed for about 8 weeks, then the flowers started to wilt and fall off. Nothing unexpected. THEN the leaves started to turn yellow and eventually brown. This happened fairly quickly and is on almost every leaf of the plant. The tips of the leaves are the darkest.
There are two brand new shoots that are growing and the bigger of the two has a small brown spot on one of its leaves as well.
See photos.
A few possibilities that I have considered.
#1 - Just normal seasonal leaf changes - does not seem likely because its MOST OF the leaves as well as a small spot on the new shoot.
#2 - Sunburn - the orchid is under artificial light 12 hours per day due to being located in a north facing room. Its a relatively cool light that has been serving me well to grown plenty of other plants (phalaenopsis, african violets, even some wildflowers) with no issues. The nobile has been under this same light for the past few months with no visible effects on the leaves before now.
Im really curious - what does a nobile with NOT ENOUGH light look like?
#3 - Over fertilizing - I do spray the leaves with the .02-.02-.02 MiracleGro orchid mist, and fertilize the roots with 0.5-1-0.5 blooming houseplant food once every two weeks. Were either of these a mistake on my part?
Temperatures are standard household temperatures, typically from 68 to 72 degrees.
Watering - typically 2-3 times per week. The nobile is potted in a fine bark and drains very very well.
Any help would be greatly appreciated. It hate to loose this guy, hes become a favorite.
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