A Genetic Study of Plant Height in Phaseolus Vulgaris. 17 
Under ordinary conditions in the garden, it is true, pole beans 
do not continue to grow indefinitely, but termination of growth 
is apparently always due to unfavorable conditions of soil or 
weather such as low temperature, extreme dryness, etc., or to the 
exhaustion of the plants by heavy seed production. That this is 
true is shown by the fact that a race of small pole beans, which 
commonly ceases growth in the garden at a height of 1.0-1.5 
meters with 15-20 nodes and perhaps dies long before the 
approach of cold weather, has been made to reach a height of 
4 meters with 30 nodes when grown under the more favorable 
conditions of the greenhouse and when allowed to develop few 
Fig. 6. — A young bean plant of determinate growth — bush bean — with a 
flower cluster terminating the axis at the sixth node. 
