|
Originally,
it
was
a
wild
growth
plant
in
Japan.
There
is
record
in
Japan
it
had
been
cultivated
and
used
as
vegetable
by
17th
century. |
This
crop
favor
cool
climate.
Short
day
condition
makes
them
flowering
.
Flowered
one
is
not
suitable
for
eating.
Under
Japanese
climate,
it's
best
cropping
season
is
May.
It
takes
1.5
month
to
harvest
after
sowing.
Even
winter
period,
it
is
possible
to
produce
by
heating
under
plastic
house.
It
takes
around
3month
to
harvest. |
Rich
in
Vitamin
A,
Calcium
and
Potassium.
Compare
to
Spinach,
it
contains
almost
the
same
rate
of
Vitamin
A
and
3times
of
Calcium. |