Plants are very special living organisms here
on Earth because they do not have to take up food
to get energy for grow. Their chloroplasts can use
the energy from sunlight to make sugar in a
process called photosynthesis.
Now, even though plants normally use light to
produce food via photosynthesis, most plants can
be induced to live in the dark if given a source
of carbon (such as sucrose, a sugar) in their
water. However, the plants probably won't develop
normally if kept totally in the dark and they will
So, to answer your question: Yes, beer might be
a source of sugar for some time - but I am not
sure if the alcohol is healthy for the plant - and
sugar water would definitely be a better source,
but I know for sure that a plant will not grow
faster in the dark but rather not grow at all.
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