Do you know what your Footcandles are for the Paphs? It could be a nutrition issue.May I ask why the leaves of most Paphs are so yellowish? First thought is that they get too much sun/light... I can see you also illuminate with LEDs. My Paphs are also quite yellowish, I always thought it was due to the substrate/fertilizer but they are also relatively close to the light source. How much LUX do yours get, have you measured that?
Mine are at 3,000 to 5,000 lux under an LED with 3000K and 5000K LEDs (which should give a mix of about 4500K).It could be a nutrition issue.
I thought Xavier (Roth) said that the leaves were yellow because of potassium deficiency.Mine are at 3,000 to 5,000 lux under an LED with 3000K and 5000K LEDs (which should give a mix of about 4500K).
I fertilize them in a week with Schwerter orchid fertilizer - according to the instructions but somehow I can't get to the ppm N when calculating (Schwerter fertilizer). In addition some limed (dolomite lime). Administered magnesium sulfate (200mg/L) and calcium nitrate (250mg/L) in the same week. This is done every two weeks. The new leaves have also become larger than the old ones and they are also firm and hard and shiny. Root growth is good. They look good so far except for that very yellow color. Xavier (Roth) always says it's due to the lack of urea. I haven't given it yet. Schwerter fertilizer contains half nitrate and ammonium but no urea.
But then, after eight months, within a month, the P. sanderianum suddenly turned greenish without warning. But I don't know why. Apparently nothing changed. Temps are 24°C / 75°F, rH 80%. The others still have a slightly yellowish touch.
89s!!!! So close!The Orchid Inn Wössner Black Wings above was awarded an 89 point AM today, it is now WBW 'Blueberry'.
My two siblings to Hung Sheng Cape 'Bitis Botanical' AM/AOS also received 89 point AMs, 'Karen Resh' on the left is named for my wife's deceased grandmother and 'Morgan Bateman' on the right is named for a good friend of ours who passed in 2020.
Better pics will follow when we have a chance to take them.
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Well, yes - and no. He said (Quote of 'Roth') that the cause of potassium deficiency is the use of an excess of nitrates as nitrogen source.I thought Xavier (Roth) said that the leaves were yellow because of potassium deficiency.
From what I can tell your light levels appear more than fine.Mine are at 3,000 to 5,000 lux under an LED with 3000K and 5000K LEDs (which should give a mix of about 4500K).
I fertilize them in a week with Schwerter orchid fertilizer - according to the instructions but somehow I can't get to the ppm N when calculating (Schwerter fertilizer). In addition some limed (dolomite lime). Administered magnesium sulfate (200mg/L) and calcium nitrate (250mg/L) in the same week. This is done every two weeks. The new leaves have also become larger than the old ones and they are also firm and hard and shiny. Root growth is good. They look good so far except for that very yellow color. Xavier (Roth) always says it's due to the lack of urea. I haven't given it yet. Schwerter fertilizer contains half nitrate and ammonium but no urea.
But then, after eight months, within a month, the P. sanderianum suddenly turned greenish without warning. But I don't know why. Apparently nothing changed. Temps are 24°C / 75°F, rH 80%. The others still have a slightly yellowish touch.
Great color on the HCM & del...
If folks haven't seen it there was a nice shout out to Tony on the Krull Smith fb page. Congrats dude.
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