RHUBARB
Rhubarb is a perennial vegetable whose leaf stalks (technically "petioles")
are cut and used in pies, jams, jellies, sauces and juice.
The blade or green leaves of the plant contain oxalic acid crystals
which can cause serious problems when eaten. Crystals can cause the tongue
and throat to swell, preventing breathing. Therefore, the leaves should
be removed before using.
Rhubarb can be eaten after being hit by a frost or freeze PROVIDED the
plant/stalks haven't wilted. If the stems appear soft and mushy, do not
eat.
Rhubarb plants will occasionally send up flowers and seed stalks in
the middle of the plants. The flowers and seed stalks can occur due to
winter's chilling conditions. Stalks can also occur due to natural maturity
of the plants.
Flower and seed stalks reduce the vigor of the plant. Energy is funneled
into the stalks instead of new growth. Therefore, flower and seed stalks
should be cut out as soon as they start forming. However, the plant may
still continue to produce the flower stalks. Keep cutting.
Plants do NOT become poisonous after flowering starts. Leaf stalks can
still be cut and used.
RHUBARB - FROST DAMAGE
Rhubarb hit by a frost or freeze can still be eaten PROVIDED the plant/stalks
are still firm and upright.
Leaf injury may be noticeable with some brown or black discoloration
on the edges. Severe cold injury may cause the oxalic acid crystals in
the leaves to migrate to the stalks when poisoning problems can occur.
If in doubt concerning the safety of eating the stalks, DON'T. Cut those
stalks off and compost. Allow new stalks to develop before eating.
RHUBARB - SEED STALKS
Rhubarb plants will occasionally send up flowers and seed stalks in the
middle of the plants. The flowers and seed stalks can occur due to winter's
chilling conditions. Stalks can also occur due to natural maturity of the
plants.
Flower and seed stalks reduce the vigor of the plant. Energy is funneled
into the stalks instead of new growth. Therefore, flower and seed stalks
should be cut out as soon as they start forming. However, the plant may
still continue to produce the flower stalks. Keep cutting.
Plants do NOT become poisonous after flowering starts. Leaf stalks can
still be cut and used.
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Rhubarb may be readily forced a month earlier than the regular season
and without digging up or injuring the crowns as follows:
1 - Cover well established strong crowns with large drain or sewer tiles
standing bell-end down and cover the tile tops with larger inverted
flower pots that fit down an inch or so over them.
2 - Pile and pack fresh horse manure around the tiles 18" to 24'?
wide and 12" or more deep.
3 - When stalks are to be pulled thrust the arm down inside the tile
and break the stems close to the ground without lifting the tile
or shifting it.
4 - When unforced crowns near-by have produced their first stalks
remove the tile, shake out and remove the straw and lightly fork
the -fine manure into the surface 3" or 4" of soil.
5 - Choose different crowns to force each year. Tiles are better
than boxes and barrels because they retain heat longer and more evenly,
are usable year after year and the stalks may be removed without
disturbing the manure and thus impairing its heating power.
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