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newly planted fruit trees whose fruit is forbidden for the first three years and must be redeemed of its holiness in the fourth.

15
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Stuff that grows by itself on public property is exempt from the rules of orla. Source: Radvaz's commentary to Rambam, Maaser Sheni 10:6 (though it's pretty clear from the Rambam himself, 10:5).
answered Mar 9 '14 by msh210
6
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Thanks to Alex's comment elsewhere (which I only saw now), I discovered the Pische S'shuva, YD 294:13, who cites Parach Mate Aharon as saying the soil must last three years, and Shivas Tziyon as quali …
answered Feb 12 '12 by msh210