Avatar for dfg138
May 12, 2020 6:15 AM CST

Hello Everyone,

I'm new to gardening and trying my hand at growing lettuce indoors under 24 hour fluorescent lights. The plants are about 3 weeks old and they started out looking great. Now, I've noticed several of the leaves have developed translucent spots (see pics) then eventually withering. I was wondering if it may be a light issue, but I can't find anything onlinE describing a similar issue. Any ideas would be appreciated!

Thanks!
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May 12, 2020 4:11 PM CST
Name: Sally
central Maryland (Zone 7b)
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Welcome!
Are lights on 24 hours? Plants need a rest too. Make it 16 on and 8 off.
Plant it and they will come.
Avatar for dfg138
May 16, 2020 7:02 AM CST

Thank you. I will give that a try!
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May 18, 2020 12:35 PM CST
Name: Ed
South Alabama (Zone 8b)
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You might check this out, too...Angular Leaf Spot
South Alabama Weather

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Avatar for JustDigIt
Apr 17, 2022 9:06 AM CST
(Zone 4b)
sallyg said: Welcome!
Are lights on 24 hours? Plants need a rest too. Make it 16 on and 8 off.


Hello,

I know this is an older post but it is the first reference pertaining to required
light cycle specifically for growing lettuces ID that I found in my search.

New member, 1st. post Smiling I just now created an account to address this directly.
Hopefully, there may soon be an opportunity to now expand this conversation
between two (hopefully more!) new acquaintances Smiling

I too am ready to begin ID lettuces. Discovering the best light cycle over the webs
has been challenging. So glad I found this site and specifically this thread.
I have rounded up supplies, have my soil, lighting units etc., etc. and will be getting
flats filled/ seeds ready today. Just need to get the lighting all figured out.
I also grow other green plants indoors and, in the same area where I'd like
to grow the lettuces. Space is limited here so, gotta make do as well as possible.

My Q? is:
Is the 16/8 light cycle set in 'stone' so to speak?
Most of what I grow is under an 18/6 cycle.
Will the lettuces grow well under the 18/6 cycle?

Now that we're here, I realize I do have a few more questions haha.

Also; what spectrum of lamps are best for the lettuces?
Best lamp height from the top of plants?
Do they grow better w/ slight air movement (fan) after seedling stage?

Thanks in advance for any further knowledge that may be imparted upon this
lettuce noob :)

Sorry to the OP if I am derailing the thread.
Finding this thread was a welcome find indeed!
If there are others seeking and having difficulty wading through so much info
on the nets w/ out easily discovering this basic information, just as I now have,
maybe this thread will be found helpful to those folks also :)

Best,
jdi
Last edited by JustDigIt Apr 17, 2022 9:07 AM Icon for preview
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Apr 21, 2022 11:38 PM CST
Name: Sally
central Maryland (Zone 7b)
Let's all play ukulele
Charter ATP Member Houseplants Keeper of Poultry Vegetable Grower Region: Maryland Composter
Native Plants and Wildflowers Organic Gardener Region: United States of America Cat Lover Birds Butterflies
My worry with 18/6 would be, does that tell the lettuce 'long day better set seed fast'? I started this time with 12/12 because I read my cilantro would do better with that.
Plant it and they will come.
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