There are many factors that determine the growth
of a seed. The amount of water, sunlight, fertilizer, and oxygen are all
important for seed growth.
Also some seeds grow into tall trees and some just into short grass. Different
seeds can grow different amounts, so growth just depends on the type of
seed and the amount of care that the seed receives.
A morning glory can grow to be 142 inches tall. A holly shrub can grow
to be 590 inches tall.
A sweet gum tree can grow to be 148 inches tall. (The Cambridge Factfinder,
edited by David Crystal)