How to measure growth rate

 Now that the greens are big enough I've started measuring their growth.  Yesterday was the first day of data collection. (You can see the experiment overview here.)

For each variety I measure the length of ten randomly selected leaves.  There are four replicates of each variety, so there are a total of 40 leaf measurements for each type of green.  I'm going to do this twice a week for the next 6-8 weeks.  All this data should make a lovely graph showing when the plant is doing most of its growth, and when it has reached maturity.

I use very fancy equipment when collecting data.

Next week I am going to start harvesting and weighing samples of greens as another measurement of growth rate.