Board Thread:Questions and Answers/@comment-10409777-20130604062600/@comment-25230228-20150711224248

You only need to do 2 plants.

Place one of the plants (you need to know the number. See Drek's post)

type the plant's number in the value box in Cheat Engine.

Click First Scan.

dig up plant and replace with another. (you need to know that plant's number too)

type the other plant's number in the value box and click "next scan"

select all the values that appear to the left. then click the downward red arrow at the bottom-right corner of the value container thing that the new addresses are in, and select all of them in the box at the bottom, double click on one of them, clicking on the number for the plant. change it to the new plant you want, then remove all addresses that change back.