Tosefta for Maasrot 1:5
אֵיזֶהוּ גָּרְנָן לַמַּעַשְׂרוֹת. הַקִּשּׁוּאִים וְהַדְּלוּעִים, מִשֶּׁיְּפַקְסוּ. וְאִם אֵינוֹ מְפַקֵּס, מִשֶּׁיַּעֲמִיד עֲרֵמָה. אֲבַטִּיחַ, מִשֶּׁיְּשַׁלֵּק. וְאִם אֵינוֹ מְשַׁלֵּק, עַד שֶׁיַּעֲשֶׂה מֻקְצֶה. יָרָק הַנֶּאֱגָד, מִשֶּׁיֹּאגַד. אִם אֵינוֹ אוֹגֵד, עַד שֶׁיְּמַלֵּא אֶת הַכְּלִי. וְאִם אֵינוֹ מְמַלֵּא אֶת הַכְּלִי, עַד שֶׁיְּלַקֵּט כָּל צָרְכּוֹ. כַּלְכָּלָה, עַד שֶׁיְּחַפֶּה. וְאִם אֵינוֹ מְחַפֶּה, עַד שֶׁיְמַלֵּא אֶת הַכְּלִי. וְאִם אֵינוֹ מְמַלֵּא אֶת הַכְּלִי, עַד שֶׁיְּלַקֵּט כָּל צָרְכּוֹ. בַּמֶּה דְבָרִים אֲמוּרִים, בְּמוֹלִיךְ לַשּׁוּק. אֲבָל בְּמוֹלִיךְ לְבֵיתוֹ, אוֹכֵל מֵהֶם עֲרַאי עַד שֶׁהוּא מַגִּיעַ לְבֵיתוֹ:
What is the [stage at which different items require tithes, just as wheat does when it reaches the] granary [stage and] requires tithes? Cucumbers and pumpkins, from when their blossoms are removed. If he doesn't remove their blossoms, from when he stacks a pile. Melons, from when they are trimmed. If they are not trimmed, from when they are stored away. Vegetables that are bundled, from when he bundles them. If he does not bundle them, from when he fills the vessel. If he does not fill the vessel, from when he has collected as much as one needs. [If collecting into] a basket, once he covers it. If he does not cover it, once he fills up the vessel. If he does not fill the vessel, once he has collected as much as he needs. In what situation does this apply? When bringing to the market. But when bringing to his house, he may eat casually from them until he reaches his house.