Herbs forum→Herb seedling health check & Thoughts on red-blue-white LED grow lights

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Cape Cod, Massachusetts
sweets777
Jul 27, 2020 3:44 PM CST
I started several herbs from seed about 2 months ago (setup notes below) using a relatively cheap red-blue-white LED grow light advertised at 50 Watt, 840 lumens. The herbs in this batch are lemon balm, lemon mint, marjoram, spearmint and peppermint.

Aside from the seedlings seeming to grow incredibly slowly (pictures are 2 months after starting seed) most are looking pretty strong though except for one of the herbs, of which almost all plants are leggy - yes I've gotten them mixed up, bonus points if you can ID it.

Could the legginess in this picture truly be from lack of light considering they've been getting 12-14 hrs of light from about 8-10 inches up? My gut feeling is to be disappointed in these red/blue lights but I'm wondering if there are other variables at play here?

The other issue is that the leaves on some seedlings are discolored with white speckling as you can see below - any thoughts on what this is/what causes it?

Seed starting setup:
- red/blue LED grow lights, 12-14 hrs/day, kept about 8 inches above plants
- watering when surface appears dry; about once a weak
- peat moss seed starting medium, transplanted into potting soil
- fan circulating air in the room

Thumb of 2020-07-27/sweets777/b87994
Thumb of 2020-07-27/sweets777/333fee

Name: Kat
Magnolia, Tx (Zone 9a)
Region: Texas Container Gardener Herbs Moon Gardener Enjoys or suffers hot summers Heirlooms
Vegetable Grower Bookworm
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kittriana
Jul 27, 2020 6:22 PM CST
Plants that grow well can use as much as 6400 uh, watts? lumens? the red/blue and full spectrum lights are usually just an added ooomph for regular lights. Yup, leggy means reaching for the sun. White speckling I will need to look closer, could be aphids at the least. I go look now, but may not be much help...yeah, you have problems with those leaf spots, looks I cannot help with.
So many roads to take, choices to make, and laughs to share!
[Last edited by kittriana - Jul 27, 2020 6:24 PM (+)]
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Name: Kristi
east Texas pineywoods (Zone 8a)
Herbs Region: Texas Vegetable Grower Avid Green Pages Reviewer
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pod
Jul 27, 2020 7:45 PM CST
You should be able to pot them up and move them outside, no?

I think some of those issues will correct themselves outdoors.

If your sense of smell is working, it should be easy to ID your herbs. Even when small they will give off the telltale fragrance when the leaves are rubbed.
Believe in yourself even when no one else will. ~ Sasquatch
Cape Cod, Massachusetts
sweets777
Aug 23, 2020 3:20 PM CST
I'm attributing most of the Issues I've noted with these seedlings to the lighting, really unsatisfied with the choice of red/blue lights and will be switching back to white LED in the future.

fortunately was able to save a bunch of these by moving them outside. Thanks everyone!

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