The only herbal tea I've ever used for my hair is catnip, so please take my culinary-based advice cautiously ( ;
In Egyptian cooking we often soak whole fenugreek in hot water before using it in cake, bread, etc. It gives off a slightly thick liquid that has the same smell as the seed (I don't use the liquid for anything, but I guess maybe I should!). Ground fenugreek we use more for spice mixes to season vegetables/meat before cooking them. It is very fine and dusty, hard to incorporate into liquid. Therefore, I imagine that whole, soaked seeds would be better to use in a "hair tea," and certainly less messy to apply to your hair than trying to mix ground fenugreek into water. Hopefully someone who has actually used it for hair will come along and be able to help you, though!
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