I tried to transplant one 4 week after seed and it hasnt to much roots.
(roots expanded only for downside not wider)
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Got a picture? Itâd be worth a thousand words, or so they say.
Transplant from where to where?
Generally, the best time to transplant is when the roots start to fill a given container. Thereâs a certain level of controversy on the âperfectâ amount of rootbinding. Some argue there are better results once a plant starts to feel confined in its container, that when you then transplant there is a more explosive growth of roots. Others, like me, would prefer to transplant before there is any root-related stress present.
Your picture shows a seedling without main, 3-bladed leaves yet. I wouldnât worry about container size yet, what is the container used in the pciture? 4" or 5" pot?
If you are worried about the slow overall growth, which that is, indeed very slow for 4 weeks, whatâs the rest of your setup like? Inside Iâm guessing, what light? How far away?
The other stuff is a concern too, even if it seems irrelevant. Whatâs the temperature/humidity like? What soil are you using? How often are you watering? What cultivar?
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I agree with @FieldEffect
Water around the outside of the pot to encourage root growth.
Also, a wet-dry cycle is needed.
So let it get pretty dry before watering again.
Probably could get 1-1.5 feet tall in the pot before you need to transplant but let the roots tell the story.
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I refer 4 week from time that it was a seed
It is in sunlight, temp wasnt good this month cool night 13° humidity is good âŚ
From a 0.2Litres pot to a 1Liter
When did it first sprout? That looks like a normal level of development for 5-10 days out of the ground.
13C (55F) is definately cooler than most seedlings want to be for a while. That will definately affect your growth speed.
If you are in the N hemisphere, which Iâm assuming you are or you wouldnât be planting right now, you may have other issues starting this early outside. Generally in the N hemisphere the cannabis season runs May-November, depending on lattitude. The issue is, for a photoperiod plant, the day is not yet long enough to ensure the plant doesnât assume it is already fall, and start flowering right away. This can cause problems, but doesnât always. Thereâs a lot of tricks people use to start their plants early, using covers to provide warmth, using a supplemental light (either during morning/evening or something called the âgas lanternâ technique).
Most, but not all, people start their seedlings indoors to avoid the low temperatures as well as the short day length if they want to get going this early.
Autoflowers are a whole other story, but because their life cycle is so short itâd probably be prudent to wait until the nights warm up to run those outdoors.
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Are you saying that little sprout cracked 4 weeks ago?
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thank you for your time.
any tip for healthy root growing.
and seocificaly for this plant is good to keep inside at nights ?
4 week from uncracked seed
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Unfortunately, that doesnât help us much. Germination (going from uncracked seed to a little green thing poking out of the ground) can take anywhere from 1 day to 10 days. When did you see green coming out of the ground?
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2 week mabey less
Well that is slow growth but on the bright side it looks healthy. You said RH is good but what is it? I also agree with above, the cold temps might be causing the slow growth. These are 24 days from cracking. How big was the container you started them in?
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humidity is 80⌠i started in a plastic watter cup
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Well in the end I would just leave it be for now bud. It may be a slow starter but when the roots fill in some it will take off in growth. @shag also makes a great point about letting it dry which will be a bit harder in that high humidity but resist the urge to water until itâs pretty dry in the pot. It should be good in time and wonât be in need of a transplant for some time yet.
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how to know when is perfect time for transplant?
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The only reason to transplant is because the roots are overgrowing their space so just keep an eye on the plant. Once itâs got good growth you can literally pop it out of the pot and take a look. When the roots are getting somewhat thick in there you would transplant. You would be amazed at the plant you can get in a small pot. This one is in a 0.8 gallon pot.
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wow good job how grams it can give
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Itâs a male so I only kept it around for pollen. Itâs a bit unhappy right now as it has grown right up into the light but I am going to trim it down some.
thank you for your time 
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Look at the base of your pot from time to time and when you see roots coming out of the drainage holes its time to repot.
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