1. We are currently experiencing issues with viewing and uploading images, our team is working on the issue.
    Dismiss Notice

Slow Growing Seedlings

Discussion in 'Newbie Central' started by wlhigh, Feb 8, 2007.


    wlhigh Active Member

    I have a problem with the growth of my aproximately two and a half week old seedlings. They are growing, but slowly it seems. There are nine seedlings, each in their own large bucket with nutrient-rich soil. They sit in a 3 foot long, 3 foot high, and 2 foot deep box painted white (for reflection), with two 18 watt flourescent lights on the top. The seedlings are about 4 inches from the lights. I have given it about 24 hours of light for the last two weeks, and have been watering usually everyday (with small amounts). There is a small mixture of yeast/sugar water mix for CO2 production. The temperature in the box is usually around 65-70 degrees, and the humidity is good. There is virtually no ventilation system, aside from me opening the box daily, and airing it out for 10 minutes, and blowing on the plants to strengthen them. The largest seedlings are about 4 inches high, and almost none of them have a second set of leaves (just the first set). I've seen a lot of pictures of other people's plants after two weeks, and they are always much bigger and more developed than mine. At this growth rate, it seems they will take months before they're mature enough to flower. I'm just wondering if anyone thinks I'm doing anything wrong? Why aren't they growing faster? Is it a CO2, lighting, or ventilation problem? Thanks for any help.

    FallenHero Guest

    your lights are too far, your seedlings sound stretched. move your lights closer, get some pics, get a fan for the stems, and you need vent.... at this point i would say a combonation of no venting and lack of light the reason for your slow comming growth.

    bleorg Active Member

    your plants need constant air. How would you feel if you were in a box that only got opened for 10 minutes a day? Also as stated above, getting the lights closer will help. 18 watts isn't much, I'd recommend getting some stronger CFLs, and putting them a bit closer.

    wlhigh Active Member

    Got some pics of my seedlings, these are approx. two and half weeks old. Does anything look wrong with them? I took the advice of installing a fan to circulate the air, and strengthen the stems, and I also moved the plants closer to the lights. I'm hesitant to add ventilation holes in the box (as it is, its not air tight anyway), because it is in a place where the temperature of the room is pretty cool (like 45-55 degrees F), and I would rather keep the heat of the box locked in. Which do people think would be worse, colder temperatures, or lack of substantial ventilation? Thanks for the info.

    NoobMaster Active Member

    Ok, im still somewhat of a beginner. Looking at those seedlings (the one in the middle is REALLY TALL!) I would definitely advise buying stronger lights (I have 26 watts...a little stronger) and lowering them as close as possible without burning the tops.

    slamminsam Active Member

    your tips are curling down it looks like you need more humidity.
    seedlings need lots of humidity about 70-85%. Its better to buy a seedling tray w/humidome keep the roots at 80 with a heating pad.
    High Tech Garden Supply
    for under 10 bucks you can get the dome, tray, seedling tray.
    Best of luck.

    dahamma Well-Known Member

    real helpful......... anyways use more wattage of the proper spectrum light, and bring em in closer. vent holes wouldn't hurt. build up soil closer to top to protect the stems. good luck!!!
    Nocturnal Cannabis

    Nocturnal Cannabis Member

    those arent lookin to good for being 2 1/2 weeks old bro. u need stronger or more light.

    uk420 Member

    as said above u need to sort some issues out. it may be a good idea to get all yr new kit and pop some new seeds. best of luck

    connorbrown Well-Known Member

    Lighting: You've only got 36 watts going on 9 seedlings. Each plant needs ATLEAST 9w. I put a 26w over each plant for 2 weeks.
    You need more light.
    Ventilation: Cold temps are 10x better then no ventilation. Plants need constant co2 and they don't produce they're own. Sucking in fresh air will give them their co2. Pushing the air out will take the o2 that they emit out of the box. Thus resulting in stronger healthier plants.
    Humidity: If you don't want to mist every hour then get humidity domes over them. I leave mine on for 1 week, after sprout. Like said above, they need 80-90% humidity. Once they get bigger and have developed a stronger leaf system you can take the domes off and bring the humidity down to about 30-40.
    Tempature: The perfect temperature is between 65-75f degrees. This shouldn't be a problem if you get more lights in there because they will make heat. And again we are back at ventilation. Outtake fans are the most important to me IMO. Get and outtake fan and cut some holes for intake. This should keep the temp at about 75.
    Stretching: Your plants have major stretching problems because of not enough light and light distance. Either tie them to a stake or get a fan blowing across them, moving them slightly. That should strengthen the stem and increase leaf production. At this point I would say that your plant has a poor root system because its focusing on trying to photosynthesize.
    Hope this helped a bit. :)
    weed monkey

    weed monkey Active Member

    i experience the same shit alot i think its the seedlings from all these fucking companys there selling shit seeds!!!!!!! i dont know if its cuz of there age or what but somthings about them is not right. theres stressed so bad that they dont grow right, and trust me its not your fault.....
    and fuck you if you dont think this is right cuz it is so go fuck yourself

    smylinacha Member

    I'm a beginner too and my seedlings looked liked that when I started. They grew quick but they looked stretched. Get stronger light on them and close to the plant. Also, and any here pls correct me if I'm wrong, but what I did to stop the stem from being so lanky is I repotted the plant and buried the stem about half way up w/ soil. I read that on here somewhere.
    weed monkey

    weed monkey Active Member

    nothing to do with light or envirnment. bad seeds, start over, nothing you can do.

    SeniorRaincloud Active Member

    need more cfls dude!

    BKCSG Active Member


    BKCSG Active Member

    This is a joke right? It is definitely not the seeds in his case, or yours. Just get better at growing from practice, listening to advice and researching non stop. I have only had problems in my first grow, after that I studied marijuana cultivation for several hours a day until I gained confidence and knowledge of the subject. So trust me... It ain't the seeds my friend, sorry to say.

    plaguedog Active Member

    It's already been said but you need more light. Typically by 2 and a half weeks my seedlings show the fourth or fifth true node.

    NI420 Active Member

    more light, more heat, and i followed the homemade co2 generator guide on this very site, it rocks! As well put a fan on em and torture em a bit wi some homemade wind, thicken up them stems! :eyesmoke: good luck

    binarybuds Member

    definitely need some ventilation but the way your leaf tips are curling down is indicative of a a nutrient overdose. sprouts like that should be in mostly inert soil

    edpal Member

    Lame @ss excuse for bad technique.

    You need a LOT more light dude. You can put 50-70 watts per square foot, of almost any light technology and not be providing anywhere near what the Sun provides on a good sunny day. One 28watt CFl per plant is still borderline low. Buy a 4 foot fixture with 6-8 T-5 HO bulbs and you will be getting closer. Keep the temps below 90 faren.(75-85 optimal) and don't worry about pumping the humidity too high. If they can get enough water from the soil the dryness of the air scarcely matters....herb grows in the desert and in the jungle(low to high humidity extremes). Let soil dry out on surface to maybe 1" down every few days to avoid root rot.

Share This Page