Reference for Sheviit 1:8

עַד אֵימָתַי נִקְרְאוּ נְטִיעוֹת. רַבִּי אֶלְעָזָר בֶּן עֲזַרְיָה אוֹמֵר, עַד שֶׁיָּחֹלּוּ. רַבִּי יְהוֹשֻׁעַ אוֹמֵר, בַּת שֶׁבַע שָׁנִים. רַבִּי עֲקִיבָא אוֹמֵר, נְטִיעָה כִשְׁמָהּ. אִילָן שֶׁנִּגְמַם וְהוֹצִיא חֲלִיפִין, מִטֶּפַח וּלְמַטָּה כִּנְטִיעָה, מִטֶּפַח וּלְמַעְלָה, כְּאִילָן, דִּבְרֵי רַבִּי שִׁמְעוֹן:

For how long are they called saplings? Rabbi Elazar ben Azariah says, until they become unconsecrated. Rabbi Yehoshua says, [until they are] seven years old. Rabbi Akiva says, a sapling is like its name. A tree that was cut down and has put out branches -- [if it was cut] lower than a handbreadth is like a sapling, and higher than a handbreadth is like a tree, [these are the] words of Rabbi Shimon.

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