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humidity dome for seedlings

Humidity dome for seedling versus no dome due to danger of soil fungus–what’s best?

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I keep reading “yes, use a humidity dome when you are waiting for your seedling to break soil and wait until she has her first true leaves to remove the dome.” and then I’ve also read “do not ever use a humidity dome as it will lead to fungus growing in the soil”

I’ve got 2 seedlings (for 2 days now) (1 Royale Haze & 1 Jamaican Dream) in dixie cups w/humidity domes over the top of each cup and a 23w 6500K cfl about 1 ” above each humidity dome (also have good airflow, temps are 71 lights off, 82 lights at 18/6). They haven’t sprouted yet and I don’t expect them to for maybe up to a week. At what point do I need to get concerned a/b fungus growth?

spambunny
Member
peilo
Well-Known Member
Active Member

Well..nobody sold me anything. I just used a clear dixie cup that fit over the top of the dixie cup containing my soil/seedling.

peilo
Well-Known Member

put seeds in a paper towel. if they are good they will sprout in 3 days, 4 max with a tail. Take a plastic cup, make sure you have drainage holes and fill with soil, preferably neutral with no nutes and soak soil till cups drain. then use a screw driver and make a hole in soil, stick the tail in and leave the pod at the top, sprinkle loose soil or push existing soil around tail and pod. The next day it should be standing up atleast 1/2 inch to an inch above the soil. 5 days max. Use 24 hours on veg. Also first week, just water, light feeding in week 2 and make sure the lights are not to close until they get atleast 4-6 inches. The pic is 19 days from papertowels

I keep reading “yes, use a humidity dome when you are waiting for your seedling to break soil and wait until she has her first true leaves to remove the dome.” and then I’ve also read “do not ever use a humidity dome as it will lead to fungus growing in the soil”

I’ve got 2 seedlings (for 2 days now) (1 Royale Haze & 1 Jamaican Dream) in dixie cups w/humidity domes over the top of each cup and a 23w 6500K cfl about 1 ” above each humidity dome (also have good airflow, temps are 71 lights off, 82 lights at 18/6). They haven’t sprouted yet and I don’t expect them to for maybe up to a week. At what point do I need to get concerned a/b fungus growth?

I keep reading "yes, use a humidity dome when you are waiting for your seedling to break soil and wait until she has her first true leaves to remove the…

DIY Humidity Dome for Seedlings

Introduction: DIY Humidity Dome for Seedlings

When sprouting seeds or rooting clones it’s a good idea keep them in a place with warm and humid air(

20-25°C / 68-77 °F). This is where a humidity dome comes in. Putting the seeds or clones in a Jiffy pot or a Rockwool cube and then filling bottom with water will create a humid climate perfect for germination and seed growth.

Step 1:

Step 2:

Step 3:

Step 4:

Step 5:

Step 6:

Step 7: Done!

Happy growing! here I am starting tomato seeds, pepper, Chinese veggies and sugarsnap peas in plastic cups that can be reused for new seeds after replanting. Holes can be cut with the exacto in the dome for a little ventilation if needed.
Don’t forget to vote for your favorite entry in the green contest: https://www.instructables.com/contest/greendesign/

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22 Discussions

I think something is dead wrong with this method.

As an aquarist, we do emerse grow method (as known as “Dry Start”) and use our tanks for that purpose, sealing the top with cling film (stretch wrap) BUT with a very important modification: After sealing the top completely, we tear a little bit from the rims of the tank just to allow the plants to get Co2 from the air as the Co2 is one of the most important variable on plant grow because it is required for photosynthesis process. You need to provide enough Co2 for your plants but sealing the tupperwares like that will cause Co2 to drop ciritical levels or even completely finish.

I would suggest to drill some holes on the top of the upper tupperware so the plants would always have fresh air (both O2 and Co2). Ofcourse this will cause the humidity to drop on the other hand but it can be by-passed by moistering with a spray and/or adding water to the bottom as needed. My guess would be doing so once a day or even once for every 2 days would be enough if the environment temperature is less than

By the way, I have serious doubts about the transparency of those tupperwares. They don’t look like they will transmit the light without emitting/changing any spectrum/temperature. Even our glass tanks (made of extra clear glass instead of regular glass which means much, much more transparent than regular glass) loses some of the light, I can’t imagine what would a plastic do – or don’t.

And again, this will also effect your grow rate in bad way, too.

So, after all, maybe it’s not the best idea to use tupperwares to make a DIY humidity dome.

I would definetely go for plexiglass if I were to build my own humidity dome.

DIY Humidity Dome for Seedlings: When sprouting seeds or rooting clones it's a good idea keep them in a place with warm and humid air(~20-25°C / 68-77 °F). This is where a humidity dome comes in. Putting the seeds or clones in a Jiffy pot or a Rockwool cube and then fi…