I've got the hang of it slowly. About 15 leaves, then it's good flavor. Do you have the plants in the garden or in the house? There was no care instruction with mine :(
From personal experience, I can report that it is not so easy to find oriental mint! But I found some in a well-stocked hardware store. Besides tea (I use a whole stem per cup), I like to use the leaves for mojitos and couscous salad.
I also like to drink mint tea. I like best the mint that I have grown myself in my garden. I know that there are many varieties of mint, but I have not heard of the Moroccan variety yet. I would be interested to know where I can buy it.
I am also a fan of mint tea from my own garden, unfortunately I do not know Moroccan mint. But this variety sounds promising. I must ask at my favorite nursery if they have something like that.