Best condition (Temp and Humidity) for seedlings

[Dimitry]

Hi there.
I wounder if there is research or someone has own experiance about The best Temperature and Humidity for seedlings.
Usualy I am starting my seedlings in march near the sunny window and it works perfectly.
This year I am planning to expand my farm and will start it in a green house (artificial light and humidity)
What will be best temp and hum setupe?

 

[deluxestogie]

Welcome to the forum. Feel free to introduce yourself in the Introduce Yourself forum.

Ideal germination is at temps above 65°F-85°F, high humidity. For seedling growth, the temps can be in that same range, with lower average humidity. I know nothing about artificial lighting, but the daily duration should be similar to outdoors.

Bob

 

[Dimitry]

To be more precise looking for (Temp and RH) not only for germination, but for the full duration in green house (Untill planting in open ground)

 

[Knucklehead]

A commercial grower on the forum starts in float trays but I’m sure the same info would apply to 1020 trays, etc. Enter “float tray” in the search box and ”BigBonner” where it says By: his posts from the greenhouse float trays will pull up.

 

[Dimitry]

A commercial grower on the forum starts in float trays but I’m sure the same info would apply to 1020 trays, etc. Enter “float tray” in the search box and ”BigBonner” where it says By: his posts from the greenhouse float trays will pull up.

Thanks

 

[FrostD]

Hi there.
I wounder if there is research or someone has own experiance about The best Temperature and Humidity for seedlings.
Usualy I am starting my seedlings in march near the sunny window and it works perfectly.
This year I am planning to expand my farm and will start it in a green house (artificial light and humidity)
What will be best temp and hum setupe?

Hey @Dimitry !

What type of lights and greenhouse setup are you thinking about setting up?
Are you trying to utilize outside air and stay on the less expensive end or go climate controlled?
What type of lights are you considering?

I would agree with @deluxestogie on Temps. For seedlings I would say Temps 65°F-85°F and RH around 65%-70%. After seedling stage I adjust what desired setpoints I want. However, I try maintain at minimum temp/ RH of 75°F/55% RH as my "Benchmark" to try to achieve. If you are considering LED's you may be able to push the temps higher. In regards to RH, I like keeping any plant past seedling stage at 60% RH or lower to prevent any mold growth.

 

[Dimitry]

Hi @FrostD

Thinking to use LED lights (cheap ones direct 220v) I have fermentation kiln 2x2x2 meters with fans inside and heat souce.

Past few years I was starting seedlings in small containers, then transplanting to individual trays in glass greenhouse (for a month more). Its very time and energy consuming.

This year want to start seedlings directly in small individual trays and prepare for transplanting in open ground.

 

[FrostD]

Hi @FrostD

Thinking to use LED lights (cheap ones direct 220v) I have fermentation kiln 2x2x2 meters with fans inside and heat souce.

Past few years I was starting seedlings in small containers, then transplanting to individual trays in glass greenhouse (for a month more). Its very time and energy consuming.

This year want to start seedlings directly in small individual trays and prepare for transplanting in open ground.

I like the area in there! You could almost setup a wire rack w/ shelves and hang from the bottom of the shelf... depending on the size and intensity of the LED lights. I'd setup the wire racking and setup 2-3 T5 LED lights underneath the bottom of the shelves. Then setup a bunch of plug trays w/ domes to get those babies started. Heat mats underneath the trays wouldn't hurt, but if the ambient temps are ok, you should be alright then in my opinion.

Good lookin leaf there!

 

[Francoisfg]

Ideal germination is at temps above 65°F-85°F, high humidity. For seedling growth, the temps can be in that same range, with lower average humidity. I know nothing about artificial lighting, but the daily duration should be similar to outdoors.

light is very important.
the scale is from around1,000 and 10,000
on each light bulb it is indicated on the bulb itself in K ( degré kelvin)
10,000 K is very very expensive, so lets say 7500K to start as light of the spring, that give the signal to the plants to grow
and lets say 2,500 the signal to flower ( autumn)

 

[NewTobaccoGrower]

light is very important.
the scale is from around1,000 and 10,000
on each light bulb it is indicated on the bulb itself in K ( degré kelvin)
10,000 K is very very expensive, so lets say 7500K to start as light of the spring, that give the signal to the plants to grow
and lets say 2,500 the signal to flower ( autumn)

Can you recommend any good but affordable 7500K lights? The highest K I find is 6500, and those are usually weak in lumens (650 or so).