minhag - Ripping out a blade of grass by a funeral?

At my great-uncle's funeral today, all of the participants (except the mourners) were told to rip out a blade of grass and say a passuk (I don't remember which).

Is this a Jewish minhag? If so, what is the source for it? What does it mean?

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Torah learned from this post should be a זכות for the נשמה of חיים בן יחזקאל

Answer

You asked: Is this a Jewish minhag? If so, what is the source for it?

Yes. it is mentioned in the Kitzur Shulchan Aruch 199:10 - סימן קצט - דין הקבורה ובית הקברות

"The custom - when leaving a cemetery - is to pluck some grass and throw it behind one's back, and say זָכוּר כִּי עָפָר אֲנָחְנוּ - remember that we are dust."

You asked: What does it mean?

Meaning #1, mentioned by the Kitzur:

"This is a reminder of לִתְחִיַת הַמֵּתִים - when the dead will come alive at the end of days - that the dead will row from the barren ground and suddenly peek up like grass."

Meaning #2, mentioned by the Kitzur:

"After leaving one washes one's hands. All this hints at the way one is purified from impurity caused by death: (1) water, mixed with (2) dust [ashes of the red heifer] and (3) grass representing the hyssop with which it was sprinkled on the impure one."

סעיף י': נוֹהֲגִין שֶׁכְּשֶׁהוֹלְכִין מִבֵּית הַקְּבָרוֹת, תּוֹלְשִׁין עֲשָׂבִים וּמַשְׂלִיכִין אַחֲרֵי גֵוָם וְאוֹמְרִים, זָכוּר כִּי עָפָר אֲנָחְנוּ. וְגַם הוּא רֶמֶז לִתְחִיַת הַמֵּתִים, שֶׁיִחְיוּ מֵעֲפָרָם, עַל דֶּרֶךְ, וְיָצִיצוּ מֵעִיר כְּעֵשֶב הָאָרֶץ. וִיכוֹלִין לַעֲשׂוֹת כֵּן גַּם בְּחֹל הַמּוֹעֵד (מבי"ט חלק א סִימָן רג). וְרוֹחֲצִין יְדֵיהֶם. וְיֵשׁ רֶמֶז, שֶׁאֵין טֻמְאָה זֹאת נִטְהֶרֶת אֶלָּא בִּשִׁלשָׁה דְבָרִים אֵלּוּ, מַיִם וְאֵפֶר פָּרָה וְאֵזוֹב.‏

It is also mentioned in the Shulchan Aruch in 376:4 סימן שעו - מנהג המנחמין, ודין מת שאין לו מנחמים