All COB Users - Lettuce Grow Challenge!!
- Thread starter OneHitDone
- Start date
OneHitDone
Well-Known Member
No nutrients in Horticubes. I belive they claim a "Starter Dose" in Rootcubes but generally by the time a cutting has taken root I have run enough water through them that I start feedung hydro fert at a low dose.
Oasis Horticube - to NFT - To my Belly lol This is what it is all about
Sunday lettuce update: greenhouse conditions, sunlight + 4000k COBs @ 20000lux, 14h lighting period, left - Grand Rapids (green leaf lettuce) right - Rouge de Hiver (red romaine)
Middle row was moved into the DWC today (12/4) and are day 14 from seed.
Bottom row is day 21.
Top row is day 28
Upper left/ Lower right are day 42. Just one more week!
I noticed a good response to the two extra hours of light. Everything seemed to grow at a quicker rate even though it was a cloudy week. The green leaf lettuce has a nicer crinkly texture and a bit deeper green color. Not quite sure if the green leaf is stretching a bit for that type of lettuce but the romaine looks like I would expect. The red romaine gained some red color over the first few days and maintained a bit through the week, but could maybe still handle more light if the red color does in fact correspond to DLI though there may be a little tip burn starting on the romaine where it is closest to the window. I am not sure yet if I want to push it up to 16 hours. edit: F it lets go to 16.
The plants are a little droopy in the picture because I took it a few hours after lights out and just did a water change but you can see the progress.
Middle row was moved into the DWC today (12/4) and are day 14 from seed.
Bottom row is day 21.
Top row is day 28
Upper left/ Lower right are day 42. Just one more week!
I noticed a good response to the two extra hours of light. Everything seemed to grow at a quicker rate even though it was a cloudy week. The green leaf lettuce has a nicer crinkly texture and a bit deeper green color. Not quite sure if the green leaf is stretching a bit for that type of lettuce but the romaine looks like I would expect. The red romaine gained some red color over the first few days and maintained a bit through the week, but could maybe still handle more light if the red color does in fact correspond to DLI though there may be a little tip burn starting on the romaine where it is closest to the window. I am not sure yet if I want to push it up to 16 hours. edit: F it lets go to 16.
The plants are a little droopy in the picture because I took it a few hours after lights out and just did a water change but you can see the progress.
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muleface
Well-Known Member
how many COBs are you running and at what wattage?
just found this...has a cool lighting chart on it
http://www.greenhouse.cornell.edu/structures/factsheets/Greenhouse Lighting.pdf
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jillxjilly
Well-Known Member
How fast does lettuce grow?
does home-grown lettuce taste any good?
does home-grown lettuce taste any good?
muleface
Well-Known Member
I'd guess around 6 weeks to harvest, but it depends on the type.
does it taste good, well, i've never eaten plain lettuce and thought to myself, wow, this is great. lol
jillxjilly
Well-Known Member
LOL....... fair
ilam
Member
You're making your lettuce flower by giving it so many hours. Lettuce is a long day plant, instead of a short-day flowering plant like Cannabis
Holy lettuce, i hope it tastes as good as it looks! How old? Grown How? What strain?
2 x 4000k COBs 68.5v x .81A = 50.5W @ 17" above the deck
I don't think any of my lettuce has bolted. I'm not sure I understand your second sentence. Most lettuce varieties are cool weather plants which I believe would make them short day plants, but I have read studies showing that lettuce can benefit from up to a 24 hour lighting period.
OneHitDone
Well-Known Member
There are short and long day lettuce varieties. They can be long day and still like cool climate (think coastal grown)
OneHitDone
Well-Known Member
I mainly grow "Rex" and it is very good in texture and flavor. Very tender and zero bitter when grown proper.
Generally 50-60 days. In the greenhouse you are at the mercy of mother nature
That's pretty, I hope I can figure out how to get that kind of color in my lettuce.
muleface
Well-Known Member
i was watching this video, and some grower turned green lettuce to red lettuce overnight. They changed the lighting from 6500k to a really narrow band with an led light. There was a time lapsed video, it happened really quickly.
Ill try and track down the video
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Yeah I saw one where they did it over a couple days with UV.
OneHitDone
Well-Known Member
There is a big difference in natural and forced coloration. If you want colored lettuce pick a variety that is that way to begin with and use proper FULL spectrum lighting.
I have a pretty good hunch lettuce with forced coloration tastes like doglog - most certainly would pucker your lips with bitterness lol
I have a pretty good hunch lettuce with forced coloration tastes like doglog - most certainly would pucker your lips with bitterness lol
I wouldn't be surprised, not to mention the desired nutritious qualities that should come along with that pigmentation. Just to clarify, I was referring to that beautiful red color in respect to my red romaine.
