As one of the
39 Melachot, the 'planting'
category also includes any forms of gardening.
Also included would be anything that encourages
plants to grow. Thus, one may not
water plants on
Shabbat.
It is likewise forbidden to place
cut flowers in
water, or even to change their water.
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Most of this information is taken
from the book "SABBATH Day of Eternity"
by Rabbi Aryeh Kaplan, published by NCSY.
In the book itself, there are notes that refer the
reader to detailed footnotes.
I am lucky to have found such a clear, concise manual
with these brief overviews of laws so vast and complex
there are Rabbis that specialize in them.