Book 29, Question 33
How can a cut stem grow new roots in a glass of water?
Many plants, such as basil, mint, and coleus, can grow roots from a cut stem.
A gardener snips a stem just below a leaf joint, removes the lower leaves, and stands it in water on a bright windowsill. In one to two weeks, thin white roots appear from the stem. The plant makes a growth chemical called auxin that triggers roots. The new plant is a clone of its parent.