how to say “to water the plants” in Hebrew
לְהַשְׁקוֹת אֶת הַצְּמָחִים
The Hebrew word for plant is צֶמַח 
listen and repeat, related to the active-simple verb ַלִצְמוֹח listen and repeat – to grow – as in:
listen and repeat, related to the active-simple verb ַלִצְמוֹח listen and repeat – to grow – as in:צָמַח לָהּ פֶּרַח יָפֶה בַּגִּנָּה.
A pretty flower grew in her garden.
And to water is the active-causative verb לְהַשְׁקוֹת listen and repeat, related to the word מַשְׁקֶה listen and repeat – a drink.
listen and repeat, related to the word מַשְׁקֶה listen and repeat – a drink.For example:
מִי יַשְׁקֶה לָנוּ אֶת הַצְּמָחִים כְּשֶׁנִּהְיֶה בְּחוּ”ל?
Who will water the plants for us when we’re abroad?