Observing Phototropism in Lettuce Sprouts
I’ve been experimenting with potential microclimates from within my house, specifically looking to see if I can successfully grow any low light cool temperature edibles from the basement. I have no any fancy equipment, but I was curious to see if the few windows that provides a stead supply of indirect light would be sufficient for some mixed lettuce seeds.
I sprinkled the seeds in some soil and ignored the setup for a week. Much to my surprise, not only did the seeds germinate, they were already over an inch long. Each little cotyledon reaching eagerly towards the light of the window. I decided to flip the container so the other side could receive more light.
Positive phototropism is the growth of plants in response towards a light source. (As you can imagine, plant roots usually exhibit negative phototropism.) I came back down to the basement in about 2 hours…all the sprouts magically bent itself almost 120 degrees towards the light. It always amazes me how quickly plants are able to move.