Which variety of olive tree
Can I use the leaves from any olive tree, or are some varieties not advised. Also are some more effective than others?
There are better varieties, being the Mission and Manzanillo varieties. Sub-species Olea Africana has good diuretic and heart antioxidant properties.
I have it on good authority that Chinese olive tree cultivars do not contain oleuropein. I do not know if they contain very little or none at all.
The Chinese olive industry is growing apace so new varieties may be imported specifically for the leaves at some stage which will change this scenaro.
If you stay with the ones above you won't go wrong but that is not to say that other varieties will not work.
I am not aware of any that are ill-advised - I think your local nursery or a good reference book would be able to confirm this.
Young vs old leaves
Which leaves are best to make a tincture?
No one has tested it as far as I know.
Probably a mixture would be best. You don't want to pull all the new leaves off for the next season and the old ones have had more time to build up resistance to pests and could be more potent.
I would not pick them too old though.
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