Why are my tomato seedlings looking yellow?

Description of your first forum.

Why are my tomato seedlings looking yellow?

Post by cheapd.. » Sun, 18 Apr 2010 09:38:36



started some tomatoes - 3 varieties, 6 of each in peat containers...used
organic potting mix (from home depot) watering with rain water....they are
couple of weeks old. I place them outside whenever it is sunny day...if
there is no sun, I use florescent lights 12 hours or so.... several have
first true leaves.........none are dark green.....they look sort of light
green color....I see the tomato plants in the stores look beautiful lush
dark green.........what am I doing wrong?
 
 
 

Why are my tomato seedlings looking yellow?

Post by Bill » Sun, 18 Apr 2010 09:52:33



Quote:

> started some tomatoes - 3 varieties, 6 of each in peat containers...used
> organic potting mix (from home depot) watering with rain water....they are
> couple of weeks old. I place them outside whenever it is sunny day...if
> there is no sun, I use florescent lights 12 hours or so.... several have
> first true leaves.........none are dark green.....they look sort of light
> green color....I see the tomato plants in the stores look beautiful lush
> dark green.........what am I doing wrong?

At a couple of weeks old, they are probably no more than an inch or two
(2.5-5cm) tall. Relax. Can put them in the ground until it is 70F.
--
- Billy
"Fascism should more properly be called corporatism because it is the
merger of state and corporate power." - Benito Mussolini.
http://www.youtube.com/watch?v=Arn3lF5XSUg
http://www.thirdworldtraveler.com/Zinn/HZinn_page.html
 
 
 

Why are my tomato seedlings looking yellow?

Post by David Hare-Scot » Sun, 18 Apr 2010 10:49:42


Quote:

> started some tomatoes - 3 varieties, 6 of each in peat
> containers...used organic potting mix (from home depot) watering with
> rain water....they are couple of weeks old. I place them outside
> whenever it is sunny day...if there is no sun, I use florescent
> lights 12 hours or so.... several have first true leaves.........none
> are dark green.....they look sort of light green color....I see the
> tomato plants in the stores look beautiful lush dark
> green.........what am I doing wrong?

I am thinking they need more light.  Once they have their first true leaves
I move mine into dappled sun.  Then as they get near ready to plant out into
full sun.

David

 
 
 

Why are my tomato seedlings looking yellow?

Post by Bill » Sun, 18 Apr 2010 11:32:26


In article

At a couple of weeks old, they are probably no more than an inch or two
(2.5-5cm) tall. Relax. CAN'T put them in the ground, until it is 70F.
Oh, you can, but not much will happen.
--
- Billy
"Fascism should more properly be called corporatism because it is the
merger of state and corporate power." - Benito Mussolini.
http://www.youtube.com/watch?v=Arn3lF5XSUg
http://www.thirdworldtraveler.com/Zinn/HZinn_page.html

 
 
 

Why are my tomato seedlings looking yellow?

Post by Pat Kiewic » Sun, 18 Apr 2010 21:09:42



Quote:

>started some tomatoes - 3 varieties, 6 of each in peat containers...used
>organic potting mix (from home depot) watering with rain water....they
are
>couple of weeks old. I place them outside whenever it is sunny day...if
>there is no sun, I use florescent lights 12 hours or so.... several have
>first true leaves.........none are dark green.....they look sort of light
>green color....I see the tomato plants in the stores look beautiful lush
>dark green.........what am I doing wrong?

Does the 'organic potting mix' include any fertilizer?  It should say so
explicitly on the bag.  Unless the potting mix comes with fertilizer
you will need to add some to your seedlings.  Perhaps fish emulsion
(if you stick to purely organic).  Dilute to half-strength.

You didn't describe your seedlings as being tall or leggy, so I don't
think they lack for light.  It is possible to sunburn your seedlings if
you move them from flourescent lights to full sunlight too quickly.
They need to be acclimatized.

--
Pat in Plymouth MI

"Vegetables are like bombs packed tight with all kinds of important
nutrients..."     --Largo Potter, Valkyria  Chronicles

email valid but not regularly monitored

 
 
 

Why are my tomato seedlings looking yellow?

Post by Bill » Mon, 19 Apr 2010 01:11:39


In article


Quote:

> >started some tomatoes - 3 varieties, 6 of each in peat containers...used
> >organic potting mix (from home depot) watering with rain water....they
> are
> >couple of weeks old. I place them outside whenever it is sunny day...if
> >there is no sun, I use florescent lights 12 hours or so.... several have
> >first true leaves.........none are dark green.....they look sort of light
> >green color....I see the tomato plants in the stores look beautiful lush
> >dark green.........what am I doing wrong?

> Does the 'organic potting mix' include any fertilizer?  It should say so
> explicitly on the bag.  Unless the potting mix comes with fertilizer
> you will need to add some to your seedlings.  Perhaps fish emulsion
> (if you stick to purely organic).  Dilute to half-strength.

> You didn't describe your seedlings as being tall or leggy, so I don't
> think they lack for light.  It is possible to sunburn your seedlings if
> you move them from flourescent lights to full sunlight too quickly.
> They need to be acclimatized.

If you use fish emulsion, be sure to get "organic" fish emulsion. Fish
have become the repositories of human waste like mercury, lead, PCBs,
and PBDEs. You don't want to be adding these to your edible gardens.
--
- Billy
"Fascism should more properly be called corporatism because it is the
merger of state and corporate power." - Benito Mussolini.
http://www.youtube.com/watch?v=Arn3lF5XSUg
http://www.thirdworldtraveler.com/Zinn/HZinn_page.html
 
 
 

Why are my tomato seedlings looking yellow?

Post by Higgs Boso » Tue, 20 Apr 2010 12:53:33



Quote:

> >started some tomatoes - 3 varieties, 6 of each in peat containers...used
> >organic potting mix (from home depot) watering with rain water....they
> are
> >couple of weeks old. I place them outside whenever it is sunny day...if
> >there is no sun, I use florescent lights 12 hours or so.... several have
> >first true leaves.........none are dark green.....they look sort of light
> >green color....I see the tomato plants in the stores look beautiful lush
> >dark green.........what am I doing wrong?

> Does the 'organic potting mix' include any fertilizer? ?It should say so
> explicitly on the bag. ?Unless the potting mix comes with fertilizer
> you will need to add some to your seedlings. ?Perhaps fish emulsion
> (if you stick to purely organic). ?Dilute to half-strength.

> You didn't describe your seedlings as being tall or leggy, so I don't
> think they lack for light. ?It is possible to sunburn your seedlings if
> you move them from flourescent lights to full sunlight too quickly.
> They need to be acclimatized.

> --
> Pat in Plymouth MI

> "Vegetables are like bombs packed tight with all kinds of important
> nutrients..." ? ? --Largo Potter, Valkyria ?Chronicles

> email valid but not regularly monitored

He may not have thought to mention "tall or leggy" but that could be
happening.

I'd suggest putting them on a table near a window that gets
 at least a few hours of sun daily.  That way they're protected from
cold.
Turn every day to avoid plant leaning in one direction.  Monitor
if too much light; if so, move a few inches away.  If too many
sunless days, resort to grow lights.  Put out to harden
as soon as frost danger past -- but be conservative; don't
rush it; if your area can get sudden frosts.  Good luck!

 
 
 

Why are my tomato seedlings looking yellow?

Post by Dan L » Tue, 20 Apr 2010 23:33:48


In article


Quote:


> > >started some tomatoes - 3 varieties, 6 of each in peat containers...used
> > >organic potting mix (from home depot) watering with rain water....they
> > are
> > >couple of weeks old. I place them outside whenever it is sunny day...if
> > >there is no sun, I use florescent lights 12 hours or so.... several have
> > >first true leaves.........none are dark green.....they look sort of light
> > >green color....I see the tomato plants in the stores look beautiful lush
> > >dark green.........what am I doing wrong?

> > Does the 'organic potting mix' include any fertilizer? ?It should say so
> > explicitly on the bag. ?Unless the potting mix comes with fertilizer
> > you will need to add some to your seedlings. ?Perhaps fish emulsion
> > (if you stick to purely organic). ?Dilute to half-strength.

> > You didn't describe your seedlings as being tall or leggy, so I don't
> > think they lack for light. ?It is possible to sunburn your seedlings if
> > you move them from flourescent lights to full sunlight too quickly.
> > They need to be acclimatized.

> > --
> > Pat in Plymouth MI

> > "Vegetables are like bombs packed tight with all kinds of important
> > nutrients..." ? ? --Largo Potter, Valkyria ?Chronicles

> > email valid but not regularly monitored

> He may not have thought to mention "tall or leggy" but that could be
> happening.

> I'd suggest putting them on a table near a window that gets
>  at least a few hours of sun daily.  That way they're protected from
> cold.
> Turn every day to avoid plant leaning in one direction.  Monitor
> if too much light; if so, move a few inches away.  If too many
> sunless days, resort to grow lights.  Put out to harden
> as soon as frost danger past -- but be conservative; don't
> rush it; if your area can get sudden frosts.  Good luck!

Hmmm...
Can Chlorosis exist in seedlings?
Could be bad seeds?

Grow lights may be better than shop lights for plants. Try transplanting
some of the plants to better soil and see what happens. For cold season
areas a heated propagation frame is nice to have for seedlings.

--
Enjoy Life... Dan

Garden in Zone 5 South East Michigan.