Tomato seedling stems turning red, wrong lights?

nnymomApril 19, 2008

My tomato seedlings stems and veins are turning red. I am using 2 48" plant and aquarium bulbs. I am new to growing under lights and was not sure which bulbs to get. This happened to me last year as well but I didn't start using the lights until they were about 3" tall. Eventually the leaves started to get reddish and started to curl. They didn't die but were rather sickly looking. Did alright once in the ground but didn't really flourish. I grew tomatoes in my window the year before no problem. They have just gotten their first true leaves so I have not fed them yet. They are growing in peat pots with seed starting soil. I am about ready to just put them back in the window!! Any help would be appreciated.

Thank you for reporting this comment. Undo

1. don't use peat pots, generally, they are a pita and they dry out too easily and they don't decay fast enough when you set out the seedlings.

2. Adjust your temperature. Tomato seedlings are not at all happy in temps less than 60 degrees and do best at about 75 to 80 degrees. When the temperature is 60 or less on a regular basis, the plants cannot absorb potassium properly and develop purple stems and leaf undersides.

3. You may have a micronutrient deficiency. A photo would make it easier to tell. Just on general principles, please get a micronutrient supplement and give your seedlings an appropriate application.


    Bookmark   April 20, 2008 at 10:51PM
Thank you for reporting this comment. Undo

I like high output 5000K fluoro tubes, compared to the plant and aquarium. P&A is just a money making gimmick, plants need just photons, the more the better. The plant has all kinds of phytochromes that gather up the photons of all wavelengths to convert them into sugars and starch. I am not sure if that is what is ur problem, but I did notice in my own garden of roses, that the 5000K works much better than the 3000K, due to the requirement of blue light for synthesis of chlorophyll.

    Bookmark   April 26, 2008 at 8:51PM
Sign Up to comment
More Discussions
More beautiful plumeria blossoms under grow lights
More proof that grow lights work! I planted this plumeria...
6" Inch Titan Inline Fan 440 CFM Industrial Grade
The 6" Inch Titan Inline Fan 440 CFM Industrial...
Dane Theisen
Lamp says "MAX 20W". Can I go higher with CFL or LED?
My lamp says that I should not put a light bulb in...
Having problems with seedlings this year
I have been starting seeds under lights for about 10...
Pepper Leaf Problem
I am new to the forum, but have a question about a...
Sponsored Products
Travelers Compass Giclee Glow 13 1/2" Brass Swag Pendant
Lamps Plus
Luxury Cuvee Champagne Set Of Four Wine Glasses
Classic Hostess
Sonneman Big Floor Cone Modern Contempo Floor Lamp
Elk Lighting Celina 5-Light Chandelier in Polished Chrome & Yellow Glass
Beyond Stores
Sconces: Designer Collection 1-Light Bronze Wall Sconce with Amber Glass Shade C
$64.99 | Home Depot
Stila Rust Swing Arm Floor Lamp
Lamps Plus
V03D Watch - Navy Dial/Copper Case/Grey Leather Strap - VOID Watches
$215.00 | HORNE
Yorktowne Large Outdoor Wall Mount
$90.20 | Bellacor
© 2015 Houzz Inc. Houzz® The new way to design your home™