Related for Taanit 9:6
יצאו וזרעו שני ושלישי ורביעי וירדה להם רביעה שניה בחמשה בניסן הקריבו עומר בששה עשר בניסן נמצאת תבואה הגדילה בששה חדשים גדילה באחד עשר יום נמצא עומר הקרב מתבואה של ששה חדשים קרב מתבואה של אחד עשר יום
He replied: Thus said R'Johanan, This verse<span class="x" onmousemove="('comment',' I.e., Joel I, 4.');"><sup>3</sup></span> was fulfilled in the days [of the prophet] Joel, the son of Pethuel, That which the palmer-worm hath left hath the locust eaten etc.<span class="x" onmousemove="('comment',' Joel I, 4.');"><sup>4</sup></span>
Tosefta Ta'anit
We ask for the rains until Nissan is over, as it says, "And rain will fall for you, the earlier and latter rains during the first [month] (Yoel 2);" [these are] the words of Rabbi Meir. And the Sages say,"Earlier rains [fall in] Marcheshvan, and latter rains [fall on] the first of Nissan (and so these dates are the timetable for prayers for rain). Rabbi Meir said to them, "Knowing that a tree makes fruit for twelve [months], and produce [grows] for six months; what have we found with trees, as it says [about it], "By its month (meaning halfway through the month), it will bear (Yechezkel 47)," so too produce, at its fifteenth day [its season ends]. Haven't you learnt, that earlier and latter rains [fall throughout] Nissan.
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