seedlimg humidity level?

Illegal Smile

Illegal Smile

Well-Known Member
50 is still ok, under that is not so good. I use a humidity dome which is the clear plastic lid off those foil baking/roasting pans. You can spray the inside of it often for even more humidity.
 
Nullis

Nullis

Moderator
Seems as if I've been mentioning this a lot lately: seedlings (unlike clones) do not need high relative humidity to sprout or thrive. Indeed, RH is best kept low for seedlings and covering with a dome is not advisable.

IMPORTANT: Don’t cover pots with plastic wrap, don’t use a humidity dome to seal off the pots, or place pots/rockwool cubes in a propagator that’s completely covered! This prevents fresh air exchange, raises humidity to excess levels, and easily facilitates the spread of fungus. The seeds then rot before they can germinate. Excess humidity coupled with lack of oxygen is the #1 cause for poor germination results!

If you germinate your seeds at room temperature, and have properly watered the substrate, there is no need to be concerned that it will dry out overnight. Only the substrate requires sufficient water for the seeds to germinate - the outside humidity can and should be be low to moderate (i.e. max. 55%). Low humidity in the room does not interfere with germination or healthy seedling growth. Remember: cannabis is not an orchid! Fungal spores are everywhere: in the air, in substrates, ... and they await the conditions to spread and attack organic substances such as seeds or the roots. Common fungal infections are pythium and fusarium. Young seedlings are also prone to such infections because their cell tissue is very soft. Over-watering and/or high humidity trigger such diseases like “damping off” which quickly kills seedlings.
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http://www.mandalaseeds.com/Guides/Germination-Guide
 
cowboylogic

cowboylogic

Well-Known Member
Above correct.(Nullis)


An easy and cheap way to raise humidity in the growroom in the winter is too use a crockpot full of plain water, lids off turned on low. Adds gentle heat and moisture for about 10 bucks. Works great...........still do your best to keep it above 35%........
 
brownbearclan

brownbearclan

Active Member
Nullis said:
Seems as if I've been mentioning this a lot lately: seedlings (unlike clones) do not need high relative humidity to sprout or thrive. Indeed, RH is best kept low for seedlings and covering with a dome is not advisable.




http://www.mandalaseeds.com/Guides/Germination-Guide
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Yeah I can vouch for that from experience. I domed my clones and would burp and mist them a few times a day and within a week I had white mold growing on my peet pellets. As soon as I un-domed them and just misted them 4x a day they snapped out of it, mold died and they did fine. =)
 
anonymuss

anonymuss

Well-Known Member
best way is to get a dome, spray the inside of the dome with distilled water (tap leaves behind white residue shit), and put that dome under your HPS so it heats up the inside of the dome and turns it into the amazon rain forest. Plus the dome keeps seedlings safe from the HPS heat / rays.
 
C

chris h

Active Member
seed was taken out of the dome after it sprouted about an inch. I almost killed it becuase I put the lil girl under a 50w hps and 2 100w MH systems, so he drooped really bad. Put her under a 23w 2700k cfl and has been doing great ever since
 
Mudslide9791

Mudslide9791

Well-Known Member
Do whatever works for you, try and experiment with different ways. I've yet to see one person on here be 100% correct in all things really.

I use a heat mat and propagation dome for seedlings for the first 5-7 days of life and they explode with growth in that time. They are ready for transplant by day 7 and moved into their first veg medium. My seedlings are touching the top of a 7 inch dome most times by day 6. They never grew like that without one, so just give it a shot and see if you like it.
 
Nullis

Nullis

Moderator
Heat mats are great for seedlings, and I don't think a ventilated dome is as likely to present any problems but seedlings in excessive humidity are certainly at increased risk of damping off or other less serious fungal issues such as development of unwanted mold or mildew on the medium.
 
Mudslide9791

Mudslide9791

Well-Known Member
Nullis said:
Heat mats are great for seedlings, and I don't think a ventilated dome is as likely to present any problems but seedlings in excessive humidity are certainly at increased risk of damping off or other less serious fungal issues such as development of unwanted mold or mildew on the medium.
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Nullis is correct about damping off. I didn't think to mention that. You get incredible growth from seedlings in the first week under a dome and on a heat mat, however, you really have to be cautious that your medium doesn't stay overly moist. You can avoid damping off by removing the dome a couple times a day and using it is as a fan to circulate the stale air around your seedlings. Also I only water my medium once and I let it dry out over the course of the week while they are under the dome and I only use a foiliar mist once or twice a day during this time.

Nice catch Nullis +reps =D
 
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