This (Gen 1:29b) is quintessential Hebrew idiom that might be rendered into English (overly redundantly) something like:
Note that in good English, the extra "tree" in the Hebrew become "that", "which", "whose", etc.
There are many examples of this in Hebrew. Here are a few more:
This word is a qal partciple, maculine singular Its meaning is listed below from BDB.
I. זָרַע verb sow, scatter seed (Late Hebrew id.; Assyrian zirû
TPPrism vi. 15; Arabic ; Aramaic , זְרַע; Ethiopic but in Sabean דֿרא
DHMZMG 1883, 15 and in proper name, Id. in MV10, pp. 242, 983) —
Qal Perfect3masculine singular זָרַע Judges 6:3; 1singular
וְזָרַעְתִּ֫י Jeremiah 31:27; suffix וּזְרַעְתִּיהָ consec Hosea 2:25;
3plural זָָֽרְעוּ Jeremiah 12:13; 2masculine plural זְרַעַתֶּם Haggai
1:6; וּזְרַעְתֶּם consecutive Genesis 47:23 2t.; Imperfect יִזְרָ֑ע
Ecclesiastes 11:4; וַיִּזְרַע Genesis 26:12; suffix וַיִּזְרָעֶהָ
Judges 9:45; 1 singular אֶזְדְעָה Judg 31:8; suffix וְאֶזְרָעֵם
Zechariah 10:9, etc.; Imperative masculine singular זְרַע Ecclesiastes
11:6; masculine plural זִרְעוּ Hosea 10:12 2t.; Infinitive לִזְרֹעַ
Isaiah 28:24; Participle active זֹרֵעַ Isaiah 55:10 3t.; זזֹרֵעַ
Proverbs 22:8; Jeremiah 50:16, etc.; Passive participle זָרֻעַ Psalm
97:11 (but on text see below); feminine זְרוּעָה Jeremiah 2:2; —
1 literally sow:
a. absolute sow (seed), do one's sowing Judges 6:3; Genesis 26:12 (J),
Isaiah 28:24 (after ploughing חרשׁ); זִרְעוּ וקצרו ונטעו כרמים Isaiah
37:30 = 2 Kings 19:29; "" קצר also Micah 6:15; Leviticus 25:11 (H),
Ecclesiastes 11:4; "" אסף Leviticus 25:20 (H); opposed to אכל Job
31:8; זֹרְעֵי עלכֿלמֿים Isaiah 32:20 (on construct compare Ges§ 130,
1); with אתהֿשּׁנה הַשׁמינִת Leviticus 25:22; followed by הַרְבֵּה
Haggai 1:6 (opposed to הָבֵא מְעָ֑ט).
b. with accusative of land אדמה Exodus 23:10 (J E; "" אסף), Genesis
47:23 (J); field (שׂדה) Leviticus 25:3 ("" אסף), compare Leviticus
25:4; Psalm 107:37; as passive participle אֶרֶץ לֹא זְרוּעָה Jeremiah
2:2 ("" מִדְבָּר).
c. with accusative of seed אֶתזַֿרְעֲךָ ׳ז Deuteronomy 11:10, compare
Deuteronomy 22:9; Jeremiah 35:7; Leviticus 26:16 (H) Ecclesiastes
11:6; followed by חִטִּים Jeremiah 12:13 ("" קצר); compare also
בִּכּוּרֵי מַעֲשֶׂיךָ אשׁר תזרע בַּשָּׂדֶה Exodus 23:16 (JE).
d. followed by 2 accusative לֹא תזרע כַּרְמְךָ כִּלְאַ֑יִם Deuteronomy
22:9; compare שָׂדְךָ לֹא תִזְרַע כִּלְאַיִם Leviticus 19:19 (H);
זַרְעֲךָ אשׁרתֿזדע אתהֿאדמה Isaiah 30:23; also of destroyed city
וַיִּזְרָעֶהָ מֶ֑לַח Judges 9:45.
e. participle active as substantive זוֺרֵעַ Jeremiah 50:16 ("" תֹּפֵשׂ
מַגָּל בְּעֵת קָציר); לַֹזּרֵעַ Isaiah 55:10 ("" לָאֹכֵל).
2 of shrub and tree producing, yielding seed, with accusative of
congnate meaning with verb Genesis 1:29 (twice in verse) (P), compare
Hiph`il 3. figurative:
a. of Yahweh's sowing (planting) Israel in the land וזרעתיה לי בָארץ
Hosea 2:25 (We וזרעתיהו, object being Jezreel); on the other hand
וְאֶזְרָעֵם בָּעַמִּים Zechariah 10:9.
b. with 2 accusative, of Yahweh's fructifying Israel and Judah יהודה
זֶרַע אדם וזרע ׳וזרעתי אתבֿית ישׂראל ואתבֿ בהמה Jeremiah 31:27.
c. of moral action, זִרְעוּ לָכֶם לִצְדָקָה Hosea 10:12 ("" קצר);
צדקה׳ז Proverbs 11:18; אַלתִּֿזְרְעוּ אֶלקֹֿצִים Jeremiah 4:3 sow not
in among thorns (said of a few righteous deeds amid much wickedness);
especially of evil-doing רוּחַ יזרעו וְסוּפָתָה יִקְצֹ֑רוּ Hosea 8:7;
זֹרְעֵי עָמָל Job 4:8 ("" קצר); זוֺרֵעַ עַוְלָה יקצוראָֿוֶן Proverbs
22:8.
d. of Israel's practising idolatry זְמֹרַת זָר תִּזְרָעֶ֑נּוּ Isaiah
17:10 (2 accusative)
e. הזרעים בדמעה בְּרִנָּה יִקְצֹ֑רוּ Psalm 126:5 metaphor of distress
followed by joy.
f. אוֺר זָרֻעַ לַצַּדִּיק Psalm 97:11 read probably זָרַח, Vrss Ol Hu
Bae Che and others
Niph`al be sown, fructified, Perfect3feminine singular וְנִזְרְעָה
consecutive Numbers 5:28; 2masculine plural וְנִזְרַעְתֶּם consecutive
Ezekiel 36:9; Imperfect3masculine singular יִזָּרַע Nahum 1:14;
יִזָּרֵ֑עַ Deuteronomy 21:4; Leviticus 11:37; 3feminine singular
תִּזָּרַע Deuteronomy 29:22; —
1 be sown:
a. subject אֶרֶץ, ולא תַּצְמִחַ ׳לֹא תִזּ Deuteronomy 29:22, compare
(of נַחַל אֵיתָן) לא יֵעָבֵּד ׳בּוֺ ולא יִזּ Deuteronomy 21:4; in
address to הָרֵי ישׂראל, וְנֶעֱבַּדְתֶּם וְנִזְרַעְתֶּם Ezekiel 36:9.
b. subject זֶרַע, זֶרַע זֵרוּעַ אשׁר יִזָּרֵעַ Leviticus 11:37 (P);
figurative מִשִּׁמְךָ עוֺד ׳לֹא יִזּ Nahum 1:14 no more of thy name be
sown, in judgment against Nineveh.
2 be fructified, made pregnant וְנִזְרְעָה זָרַ֑ע Numbers 5:28 (P; of
woman).
Pu`al Perfect3plural זֹרָ֑עוּ Isaiah 40:24 of princes and judges under
figure of trees ("" נִטָּ֑עוּ, שֹׁרֵשׁ בָּאָרֶץ גִּזְעָם).
Hiph`il Imperfect3feminine singular תַּזְרִיעַ Leviticus 12:2;
Participle מַזְרִיעַ Genesis 1:11,12; —
1 produce seed, of herb, with accusative of congnate meaning with verb
Genesis 1:11,12; apparently denominative from זֶרַע; compare Qal 2. 2.
of a woman, = bear a child תַּזְרִיעַ וְיָיָָֽלְדָה זָכָר Leviticus
12:2.
זְרַע noun [masculine] seed (compare Biblical Hebrew I. זרע); —
construct אֲנָשָׁא ׳ז Daniel 2:43 seed (offspring) of men.