There's a huge difference in how long plants
will live if you don't give them what they need to
grow. Seeds can live a long time. The oldest
seed that germinated is a 2000-yr-old date palm
seed. There's an internet site that says seeds
from corn, beans, and lettuce last 2-5 yrs.
Young plant seedlings will die in a few days
or less if they don't have water or light.
Older plants will live longer without water or
light before they die. Another problem for plants
is that they can die if they get too much water.
Too much water drowns the plants, because their
roots root and don't get enough oxygen.
There's no simple answer to how long a plant
will live without light and water [and air!],
because there are so many different kinds of
plants and trees. Desert plants like the
saguaro cactus can live over 100 yrs with
little water. It would probably take more than a
year for a saguaro cactus to die without water.
Some scientists did an interesting experiment
with young pine trees. They kept them in a
greenhouse with no water. The first tree died in
29 days - less than a month. The last tree died
in 147 days - almost 5 months! I don't know how
old the young trees were when they stopped being
watered or how many trees there were.
Thank you for your question - it was a hard
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