Daisy would water means Mark will water.
You understand what I'm trying to do, and now I have a phrase for it. Inflection point. The point (watering) on the plane curve at which the curvature (not watering) changes from concave to convex.
The tangent has met the curve! Yes, I don't want to stress the plant whatsoever. Water means photosynthesis.
Thanks for the practical application of calculus.
And to think all those years ago, my HS teacher said I would never use calculus again.
Time to water the plants.