Here's a introduction to plants powerpoint I put together for my elementary school winter camp. Use it if you'd like, make it better if you feel like it.
There were 3 or 4 slides from a basic powerpoint I found somewhere on the internet, I forget the author. Thanks to whoever you were.
The last 3 slides are for an activity I'll be doing afterward. Delete them if you'd like. Use them to introduce a few vocabulary otherwise.
Simply put, the activity has every student with one printed out vegetable. They'll need to audibly describe it via color, taste, size, etc. They'll then make "my plant" booklets.