Observe the appearance of the plants, including color, leaf size, leaf spacing, and any other observations and record them. At the end of the nine-week growth period harvest the plants. Harvest by immersing the container in a tub of water and carefully washing the soil off the roots. Be careful while harvesting to avoid loss of plant material. Record the wet mass of the plants for each separate pot.
Air dry the plants for several days in a sunny location until a constant dry weight is obtained.
Record the dry weight of the entire group of plants for each separate pot. Record the appearance, including color, leaf size, leaf spacing, and other significant observations. Include all four pots on one graph for comparison. Plot the average for each pot only. Using the data collected from the harvesting of the plants, create a bar graph with mass on the vertical axis and each pot s label on the horizontal axis.