Plants not happy... Any help guys? :/

[Synch22]

Hello there.
This is my second attempt on growing.

Grow in Soil with 35% perlite.
Ph: 6.5-7.2
Photoperood Strains.
Almost 3 Weeks Old.
Temps 17.5-21C
Humidity: 45-75%
Number of plants: 3

So guys I dont know what is wrong.
They look sad and have droppy leaves.
Also 2 of them started showing Brown spots.
One has really dry paper like leaves.
Watering was every 2-3 days about 50-75 ml each (1L pots).
Havent used any nutes yet.
Do you think I can revive them?

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[ToFarGone]

Alright. First thing. Post pictures through the site please and not 3rd party. I’m not opening each attachment to look at those pics

 

[ToFarGone]

What light are they under?

 

[Synch22]

Alright. First thing. Post pictures through the site please and not 3rd party. I’m not opening each attachment to look at those pics

Hey sorry about that.
They are under 50watt Led.

 

[Moflow]

Any more information on the 50 watt led? Pics?
How far is light from plants?
Maybe need more light.

They look ok to me. Indica plants, what strain are they?
Are they in a tent?
Do you soak the plants so a little water comes out drainage holes then let them dry out until they feel light before watering again?
Any roots showing at bottom of pots?

 

[Synch22]

Hey bro and thank you.
Here is the Light. 6500K
I think its good for 2-3 Weeks.
Woulndnt the leaves curl up or plant stretch if They needed more Light?
I actually had my Light until the point my finger didnt get heat from it about 7-10 cm and then I though its too close so now is at 20cm.
Well, two of them have Brown spots and the leaves on second plant photo are really dry and curling down. And the growth for 3 Weeks isnt that much.
Yes I do that. But not till runoff.
I can barely see two tiny roots in the bottom of two of them Yes.
Oh and I now added the pic of the third plant. Forgot it.

 

[Moflow]

That light, 6500K, will keep them short n squat.
Probably covers 18" x 18" for veg. Have you reflective walls to keep the light on the plants?
What nutes are you going to use?
They'll be ok in those pots for another week or so.
You can slide the plant and soil gently outta the pot and see the roots and slide it back into pot again if it has enough room for another while but leave the awhile yet.
Have you a bigger light for flowering them with?

 

[Synch22]

That light, 6500K, will keep them short n squat.
Probably covers 18" x 18" for veg. Have you reflective walls to keep the light on the plants?
What nutes are you going to use?
They'll be ok in those pots for another week or so.
You can slide the plant and soil gently outta the pot and see the roots and slide it back into pot again if it has enough room for another while but leave the awhile yet.
Have you a bigger light for flowering them with?

Ive heard that 6500k is the Best for VEG.
I dont think that Light is the problem, Ive vegged before a other plant 3 times bigger than them in 3 Weeks.
Yes in 2 days Ill put the 150WATT 3000K.
Walls are White closet grow.
I ll use the biobizz nutes

 

[Moflow]

Are these plants in a colder environment than the last ones?
They'll grow slower the cooler they are.
Where the last plants a different strain, maybe? Faster growing, more vigor?
When did you start feeding the last plants?

 

[onegreenthumb]

It looks to me like the ph is a little to high that is why you have the strange purple pigment on the young growth

 

[Synch22]

Are these plants in a colder environment than the last ones?
They'll grow slower the cooler they are.
Where the last plants a different strain, maybe? Faster growing, more vigor?
When did you start feeding the last plants?

Yes They are. Temps go down to 17c sometimes 15.5 with lights off cause its cold now But not for too long.
Yes They were autoflowers maybe thats why.
I started feeding Last plants 17 days from seed.

 

[Synch22]

It looks to me like the ph is a little to high that is why you have the strange purple pigment on the young growth

Hello. Purpling occured when They were at low Temps for 6 days when I wasnnt home and told a friend to take care But didnt close the window and thats why it happened. Im sure about that

 

[onegreenthumb]

Hello. Purpling occured when They were at low Temps for 6 days when I wasnnt home and told a friend to take care But didnt close the window and thats why it happened. Im sure about that

I have never seen a plant in veg turn purple from the cold, but sounds like you know what your doing, good luck growing

 

[Synch22]

I have never seen a plant in veg turn purple from the cold, but sounds like you know what your doing, good luck growing

I didnt mean to sound like I know better or something. Im pretty sure it happened from the cold. Do u Think I can make them healthy and happy even if that means ill have to veg longer?

 

[spek9]

I have never seen a plant in veg turn purple from the cold, but sounds like you know what your doing, good luck growing

Stems (and even plant material) turning purple is definitely a very well known symptom of cold temperatures in the grow area. Some people purposely crank their temps down in flower to enhance the purple colour in their buds with certain strains.

In veg, cold temps are not cool (pun intended).

 

[Kassiopeija]

Yes They are. Temps go down to 17c sometimes 15.5 with lights off cause its cold now But not for too long.

hi, this is too cold for either BioBizz or LED least to say, both of them.
70% of your fert has to be broken down by bacteria, they need warmth to multiply themselves.

 

[onegreenthumb]

Stems (and even plant material) turning purple is definitely a very well known symptom of cold temperatures in the grow area. Some people purposely crank their temps down in flower to enhance the purple colour in their buds with certain strains.

In veg, cold temps are not cool (pun intended).

All I have is my 15 years growing experience( so it could be possible) to go from and in all that time I have never seen a veg plant turn purple from cold.... during winter the veg room can go down to 45 degrees at night and I have never seen purple from cold on a vegging plant.... it is 58 in there now that is my experience..... but I have seen what is pictured from poor soil nutrients and high ph

 

[CanadianJim]

Looks like a phosphorus deficiency to me.
As to the purple, it's only a symptom if it doesn't disappear as the leaf grows. I have had a couple plants that had a red hue to the new growth. As the leaf got bigger it lost the red, and the leaves were perfectly healthy.
The temps may need a bit of a boost, but cannabis can grow fairly well at a lower temperature than some people think. Especially if it has been in those conditions since germination.

 

[Moflow]

Its easier growing in optimum temperatures @Synch22 so get your temperatures up, close the window lol
I've been growing in cold room temperatures for years.
Biobizz or multipurpose compost and perlite. And all leds.... stop laughing now.
Heatmats are the answer. Getting the soil temperatures up is the main thing when attempting to grow in the cold, in my opinion.
It would be around 43°F in my attic now and I've 4 plants in 10 litre pots plus 2 small seedlings on a heatmat and they're looking good. I also water with tepid, rather than cold water.
Tent is at ~71°F lights on, drops to 53°F lights out.
Hut is at ~ 78°F lights on, 57°F lights out.
Purpling on plants could be strain related.
Glad to see another "Cold Temp Grower" @onegreenthumb

 

[Synch22]

I saw purpling in all New growth leaves on all 3 plants when I returned home. So its for sure from the cold Temps. I put the hps 250watt today and Im going to stick with that for a while. Temps now are 27-28 with lights on and I open the AC when They go off and temp stays at18-19 So I guess that Will help them.