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OfflineCoolBreeze
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Registered: 05/18/14
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Last seen: 8 years, 7 months
Seedlings-Very slow growth
    #731980 - 05/18/14 06:36 AM (10 years, 7 days ago)

These plants are over three weeks old, I used sta-green tree and shrub soil w perlite 4 CFLs 5500k I couldn't find any 6500k bulbs, they seem like there not getting any bigger, do they look healthy? Any advice?




[url=https://files.growery.org/files/g14-20/041596825-image.jpg]

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OfflineCoolBreeze
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Re: Seedlings-Very slow growth [Re: CoolBreeze]
    #731981 - 05/18/14 06:44 AM (10 years, 7 days ago)

I also bought super thrive but I wanted to see how they react to the soil and thought they were too young to handle

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OfflineDoc
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Re: Seedlings-Very slow growth [Re: CoolBreeze]
    #732059 - 05/18/14 06:29 PM (10 years, 7 days ago)

how far are your lights...they should be within 6 inches or closer to really get good growth out of them...but have a fan circulating the heat so the tops dont get burned!

edit: oh sorry I just noticed the pic. Do you have any idea of what your soil pH is or your water pH and what kind of nutrients the soil you used has? Theres a pretty good chance you might need to adjust pH or nutrients, also, are you sure you're not overwatering?


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Edited by Doc (05/18/14 06:31 PM)

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InvisibleDeadkndys420
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Re: Seedlings-Very slow growth [Re: Doc]
    #732152 - 05/19/14 04:04 PM (10 years, 6 days ago)

6 inches is to far for cfls imo. 2-4 is where you want it.

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OfflineCoolBreeze
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Re: Seedlings-Very slow growth [Re: Deadkndys420]
    #732166 - 05/19/14 05:44 PM (10 years, 6 days ago)

I wait till the top layer of soil is crusty then I water, I don't know the ph level I'm gna pick up a tester tomorrow, I was worried about the plants burning if I put them too close, I have a small fan maybe I'll go three inches away, I just haven't seen them change at all for days and was worried they were dead for good

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OfflinegeokillsA
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Re: Seedlings-Very slow growth [Re: CoolBreeze]
    #732676 - 05/22/14 06:02 PM (10 years, 3 days ago)

Unless the plants end up touching the CFL bulb, they will not burn.  Those lights need to be close for best results.

It is also possible that your soil is too low in nitrogen, as this will definitely cause seedlings to stall out and appear pale green/yellow (as yours appear to be).  This happened in one of our new outdoor raised beds where we planted tomatoes and wondered why the heck they were stalled out.  We tested the soil and even though we bought a mix that was supposedly enriched, it had practically zero nitrogen in it.  Once we started adding a nitrogen rich fertilizer during watering, the tomatoes took off.  I would buy a test kit at your local garden store or online - this one works pretty well as long as you follow the directions.  And if it does turn out that your soil is nutrient deficient, you should start to fertilize at 1/4 the recommended strength, because those small seedlings may be sensitive to a rapid swing in the soil profile.

Good luck.


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