Urea vs urea free fertilizers
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  #1  
Old 03-19-2021, 07:49 PM
avian avian is offline
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Urea vs urea free fertilizers
Default Urea vs urea free fertilizers

I've been using Grow More 20-20-20 and my orchids seem to be OK with that. Only use @1/4 tsp in a gallon per watering most of them time. Every few weeks I just use plain water. I was wondering, though, if it would be better to use urea free fertilizer such as Grow More 20-10-20 or something else.
20-20-20 strength was recommended to me by a very reputable orchid grower/hybridizer. Never specified a brand or that it should be urea free.
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  #2  
Old 03-20-2021, 09:04 AM
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Orchids can use all three forms of nitrogen - nitrate, ammoniacal, and urea - but urea is the least-well absorbed of the three.

1/4 tsp/gal every 5 to 7 days of either formula is fine.
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Old 03-20-2021, 10:28 AM
rbarata rbarata is offline
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If I'm not mistaken, urea fertilizers require a regular plain water watering to prevent salt accumulation in the medium.
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