Botanical Study No. 3

I have three broccoli plants I've been tending since November.  They're finally starting to fatten up at the top.

Broccoli has beautiful silver-green leaves, but I'm having trouble matching the colors my eye perceives to the colors I can mix in my paints.  So I tried making a Viridometer, a green version of a Cyanometer-- a tool for matching perceived colors with actual colors.  James Gurney recommended the Cyanometer in his book, Color and Light

I went to Lowe's and got some (free) Valspar paint chips, which have these nice little windows:

...And compared them to the lights and shadows on the broccoli leaves.  The results were startling.  The colors that matched the best were much darker than I thought.  I'm still not sure how to apply this new knowledge to painting.