Calvert Street- When to Water

Hello Garden Friends,

This past Friday at Calvert Street Elementary I taught the students when to water. The lesson started with a plant anatomy lesson zooming in on the leaf. With tiny dots I drew stomata on the bottom of the leaf, I told them that the stomata are the reason a plant stands up straight even though it doesn’t have any bones. These tiny pores in the leaf allow for gas exchange. Carbon dioxide flows in and oxygen and water flow out. The pathway of the water starts in the roots where there is high water pressure and ends just outside the stomata where there is low water pressure. Because pressure wants to be relieved, the water moves from high concentrations in the soil, through the stem, and pulled out through the leaves into the relatively dry air.

I then posed the question, “Knowing this, what should the plant look like when there is no water in the soil?”. A few of the students knew right away. The plant will look wilted and not sticking up straight. After the answer was revealed it made a lot more sense to the rest of the class. Afterwards, we made cool season veggie wraps with shredded cabbage and carrots.

Until next time, grow on!
-Jeff Mailes