Germination time also depends on the age of the seed in addition to the other variables mentioned above and if you don't save your own seed you have no idea what the seed age is.
Traded seed you might know if you ask your source. Purchased seed in the US has a packed for date from some commercial places, but that's the pack date, not when the seed was produced.
The only variety that I know of that even with fresh seed takes about two weeks to germinate is Mirabell, a lovely thumb size pale yellow cherry that was originally a commercial variety from Germany many years ago.
Carolyn
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