I mentioned Ultimatte because I use it and it's a de facto industry standard. It's probably overkill for what Jim Sachs is trying to do. There are plenty of keyers out there that are affordable and probably do near as good a job.
The question is, does Ultimatte work with day-glo orange? Cause these plants are nearly blue.
There is no problem using a keyer that handles only blue/green (Ultimatte will key any colour you want). You just hue-shift the whole image until the background is blue/green then shift it back when you are done
