root in

root (something) in (something)

To place something, especially a plant, into something else in order for it to grow roots. I couldn't root any of the vegetables in my back yard because the soil was fool of rocks. You should root the flowers in pots before attempting to plant them in the ground.
See also: root
Farlex Dictionary of Idioms.

root something in something

to start a plant growing roots in something. I tried to root the plants in sand, but they died. You have to root this kind of tree in very rich soil.
See also: root
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

root in

v.
1. To cause something, as a plant, to grow roots in something: The gardener rooted the plant in good soil.
2. To have something as a primary source or origin. Used in the passive: Homelessness is very often rooted in poverty. The word "tantalize" is rooted in Greek mythology.
See also: root
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • a fast talker
  • a/the feel of (something)
  • a necessary evil
  • (I) wouldn't (do something) if I were you
  • a horse of another
  • a horse of another color
  • a horse of another colour
  • a straw will show which way the wind blows
  • a crack at (someone or something)
  • all right