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Anyone know how to successfully get olive tree cuttings to grow roots?
I took ca. 15cm long prunings in late September, removed all leaves but a few on the top and put them in a glass of water, but until now, 9 weeks later nothing has happened yet (I successfully got tomato, laurel cherry, cherry plum, ligustrum and fig cuttings to grow roots in water glass, took between 10 days and 6 weeks - the other ones that don't want to grow roots either are true laurel and Lantana camara).
First I had them stand warm on my PC water cooling exhaust fan (22-24°C) for a few weeks, then I put them cooler (13°C now, sleeping room) to hope to induce growth this way, and in both cases rather shady, but nothing happening yet.
Do I just need some more patience or do I have to put them even warmer maybe? Or sunnier? (At least tough luck for the latter now in that season)