see plant drink
Put 6 to 10 drops of food coloring into a plastic cup one
quarter filled with water. Cut about 1/2 inch off the bottom
end of a celery stem that has leaves. Put the cut end into
the colored water. You should see results in between 4 and 24
hours. Color will slowly travel up into the plant.
Any white flower such as a carnation or Queen Anne's lace
[wild carrot] works very well. You could use three flowers,
each in differently colored water. Or a single stem can be
split into halves and each half put into its own container
with the two containers having differently colored water.
Red, blue and yellow coloring shows up best. Use enough
to make the water bright. Ink can also be used. Short stems
produce results faster. If a celery stalk without leaves is
used also cut about 1/2 inch off the top.