As you can probably imagine, plants lacking
chlorophyll are typically at a disadvantage, since
chlorophyll converts light into energy for the
plant to be able to grow. However, "albino"
plants (that have little to no chlorophyll)
are not unheard of - this article from National
Geographic talks about albino redwoods that are
able to survive by feeding off of their healthy
Chlorophyll can also be missing from only a few
parts of a single plant with healthy leaves (which
sounds like the case for your hoary cress). This
can be caused by nutritional deficiency or
a genetic mutation.
Hope this helps!!
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