Quote:
Originally Posted by Tetra73
Plants do not use their leaves to absorbed nutrients. For orchids, spraying on the leaves may cause rots. I only use the better gro orchid ferts. I make sure it does not contain urea. And it has micro nutrients as well as macros. I just grab a pinch and to mix it with my water and to spray on the roots and the medium once a week.
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There is absolutely no reason to avoid urea in fertilizer. Much of the "avoid urea" argument is based on a lot of misinformation. There is scientific research that shows that urea is very effectively used by orchids.
Also, many plants do absorb nutrients through their leaves, though orchids with waxy-textured leaves probably do not absorb much through foliar feeding.
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