| I used Neem a lot when I lived in the US. Because my collection was largely housed in a sun room (part fo my apartment ) I didn't want to unleash chemicals in my breathing space. I used Neem at a concentration of about 1 tablespoon with about 1 tablespoon of dish soap to about 1 quart/litre of water. I used it only on my thick-leaved plants like Cattleyas and typically used it for soft bodied insects like mealies. I had good results with this method and my plants experienced no visibly detrimental effects form the oil.
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