Again, these plants just wont stop growing.
The plant in the humus is now 12 centimeters tall and a pretty green color. The sand now has three plants. The heights of the three plants are 12 centimeters, 9 centimeters, and 8 centimeters. They are growing quickly, but I wonder why they are still a yellowish color instead of green? Can you think of any reason this may happen?
The humus does have another bean trying to sprout out. Can you see it?
The pebbles and clay have still made no changes since the last time you saw them. Did you predict that would happen? The topsoil has one plant that is now 10 1/2 centimeters and trying to sprout a second plant.
Which soil appears to being doing the best job?