Biologists found in 1995 that by turning on a gene called Leafy they could induce flowering in an aspen seedling, right, when it was only six months old and several centimeters high. An aspen tree usually does not flower until it is between 8 and 20 years old and 9 m (about 30 ft) tall. The aspen seedling on the left is also six months old, but was not altered.
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