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Re: Yellowing Seedlings/Plants

Hi Toni:

As I understand it, the blue end of the spectrum (cool whites) is
best for foliage production and the red end (warm whites) is best for
blossom/fruit production. I usually move my seedlings to the combo
(cool/warm) lights when I want them to bloom. If all-cool worked well
for you last time (same kind of plants?), going back to it might be
the best plan. I'd also up the amount of lights-on time -- I get my
best results with 16 hours on, 8 off. You also might want to consider
the age of the fluorescent tubes; if they're more than 8-12 months
old, I'd replace them.

I don't want to alarm you, but since you mentioned the 'Sam's Magic
Earth' by name (and I'm assuming that this is the product produced
for Wal-Mart's 'Sam' -- if not, what I'm going to say is completely
irrelevant, so please ignore it!) ... I bought some a couple of years
ago, and had a *terrible* time with it. It was full of uncomposted
wood chips, twigs, etc. and the plants I planted in it did VERY
poorly until I re-planted them in different soil. I put the rest of
the bag on my compost pile and the chips, etc. *eventually*
decomposed. The 'recipe' may have been changed by now (hopefully it
has), but I'm definitely not curious enough to invest in another bag!

FWIW -- I hope some of this is of use to you.

Happy trails.....

     Sue Drake
     Southeastern WI -- USDA zone 4b/5a
... An immaculate house is the sign of a mis-spent life ...
----------
On Tuesday, March 11, 1997 8:41 AM, you wrote:
>
> Dear List Members:
>
> I posted this question previously and didn't get an answer, so here
it goes
> again.  My seedlings, which are little at all anymore, seem to be
yellowing.
>  I am giving them the appropriate fertilizer (very little).
>
> This seemed to start happening when I changed from all "cool" bulbs
to 1 cool
> and 1 warm in each unit.  Can anyone address this issue?  Should I
go back to
> all cool?  Last year I only used cool and didn't have this problem.
>
> I've also cut back on the hours the plants are receiving light-- 12
on 12
> off.  This hasn't helped either.  Most of the plants are now potted
in "Sam's
> Magic Earth."
>
> Any help would be appreciated.
>
> Toni
> Zone 5
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