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  • From: Beth Barber <rehobothhomestead AT yahoo.com>
  • To: Market Farming <market-farming AT lists.ibiblio.org>
  • Subject: Re: [Market-farming] Bolting of Pac Choi
  • Date: Mon, 16 Jun 2003 07:04:53 -0700 (PDT)

Yes, my Mei King has bolted but the Joy Choi is
holding steady. Very upstate New York.
--- Pat Meadows <pat AT meadows.pair.com> wrote:
> On Sat, 7 Jun 2003 07:13:22 -0700, you wrote:
>
> >Has anyone had problems with Mei King Pac Choi from
> Johnny's bolting
> >this season. We have used their seed for five years
> with great
> >success-this year our last three plantings have
> bolted. We used seed
> >we purchased from Johnny's this season. Weather has
> been on the cool
> >side-the opposite of what might cause bolting. Even
> the starts in the
> >shade house appear too tall-looks like they too
> might bolt.
> >
>
> I bought a book this year called 'Oriental
> Vegetables' by
> Joy Larkcom - this is a wonderful book, btw, lots of
> good
> information (although the author is British and
> doesn't
> understand USA climates: but still the book is
> terrific for
> anyone growing Asian veggies, IMHO).
>
> Anyway, she says:
>
> --------------
> The bolting problem
>
> Under certain conditions, a number of the oriental
> brassicas
> have a tendency to bolt...The causes of bolting are
> complex
> and interrelated. To a greater or lesser extent the
> following factors play a part:
>
> Low temperatures in the early stages of growth -
> This is
> thought to be the single most important factor. Low
> temperatures, both when seeds are germinating and in
> the
> early stages of growth, lead to the initiation of
> flowers
> instead of leaves. Put very simple, young plants
> need to
> 'clock up' a certain number of heat units to prevent
> bolting: once this has been done they can be
> subjected to
> lower temperatures without bolting.
>
> ---------------
>
> She then goes on to list other factors that can
> contribute
> to bolting, including day length, genetic factors (I
> think
> you've eliminated those by having used it
> successfully
> before), and 'various kinds of stress'. She goes on
> to say
> that stressors such as 'transplanting, lack of
> water,
> over-weating, or sudden temperature changes can
> exacerbate
> the tendency to bolt.'
>
> I hadn't realized that cold temperatures could cause
> bolting
> before I read the book. BTW, it really is an
> invaluable
> book for anyone interested in growing Asian
> vegetables. (I
> think I said that before, sorry.)
>
> It's available used at various places, and you can
> find a
> list of the places that have it used, and their
> prices, at:
> http://www.addall.com.used . My copy cost $8.00 and
> it's
> really worth a lot more to me.
>
> Pat
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