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My snapdragon seedlings are spindly.

Posted by Jerry71 6a (My Page) on
Wed, Feb 2, 11 at 13:47

Even though I grow my seedlings under full spectrum fluorescent grow light my seedlings are very spindly. They germinated in 7 days and now are 7 days old (7+7) and about 1" tall but as thin as a hair. The light is on 24/7 and about 12" from plants. What did I do wrong? Do they need fertilizer? Few hours of darkness? I am new to growing flowers from seed.

Follow-Up Postings:

RE: My snapdragon seedlings are spindly.

"Full spectrum" doesn't necessarily mean a lot when it comes to fluorescent bulbs. Some bulbs advertised as "full spectrum" aren't much different than "normal" bulbs. I use a combination of 4100K and 5000K bulbs, and get pretty close to an ideal spectrum for my seed-growing needs at a reasonable price.

12" is a pretty large gap unless you are using strong, high-density lighting. I have my fluorescents hanging so that they can be easily adjusted from 0" to 10" from the plants. Some of my benches have a larger range for larger plants.

It is a good idea to give plants a few hours of dark. They need to rest too. I typically set timers for 16 hours on / 8 hours off.

RE: My snapdragon seedlings are spindly.

Thanks for such a quick reply. The color temperature of the lamps don't seem to be problem. I grew tomatoes, basil and peppers under same light and all were thick stemmed and robust plants. Maybe the distance as you suggested. Maybe too much plain water? I don't want to loose these seedlings :(
I'm setting up the time right now. Thanks for help.

RE: My snapdragon seedlings are spindly.

I second dianemumm, no more than 2" from the top of the plant to the light. Your seedlings are stretching to get to the light.

RE: My snapdragon seedlings are spindly.

Thanks robin_main. I have lowered the lights to about 1.5" 4 days ago and already I see that they are sturdier. I might have a snapdragon basket after all.
Thanks to all.

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