Rhubarb
Question:
It is April 6th. we are
having very cold weather
conditions. Temps are
suppose to get as low as
19 F. Prior to this we
have had almost record
setting temps. The rhubarb
has 4 to 6 inch stalks on
the plants. The old saying
here is that frozen rhubarb
is toxic and should not be
eaten. Is this true? I
know that the leaves are
not edible.
George

Answer: Rhubarb
is one of the few crops
that have this
characteristic. Rhubarb
should not be harvested
when the leaves are wilted
and limp after a hard
freeze. Not only do the
leafstalks acquire a poor
flavor and texture, but
the leaves and eventually
the stem may become toxic.
Rhubarb
leaves should never be
eaten, and petioles (the
part you eat) should be
harvested ONLY from plants
that have suffered no
frost damage. Rhubarb
leaves contain oxalic
acid, a toxic substance
that may move into the
petioles after frost
damage. When consumed, the
oxalic acid can
crystallize in the kidneys
and cause permanent damage
to the organs. All
petioles that have been
exposed to freezing
temperatures should be
removed and discarded. The
re-growth is safe to eat.
As normal harvest begins,
always leave at least
one-third of the petioles
un-harvested to sustain
the plant.
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