Brownish spots on leaves

[GrayZone]

Plants are clones, now about a week in soil. At first, they got a bit stressed with the light(150w HPS), as they were under neon light for a while. I raised the light and(don't ask me why, I shouldn't feed them for now) gave them some BioCanna vega. They're in BioBizz light mix, with some added worm castings(5-liter worm castings on 20-liter LightMix).

The spots appeared today, with a bit of tip-clawing. Not sure what it is but I think I managed to nute-burn or light-burn them.

What do you think, what's this about?

 

[exoticrobotic]

I've found added worm castings can burn my young plants so have never bothered with it.

A suitable compost with a suitable nutrient line is all you really need. No worm castings/guano is needed.

I am using the same nute line as you and feed them 1/3 strength at seedling stage upping it gradually to full strength at 6 weeks old, then onto flowering with full strength flower nutes.

What strength are you feeding them?

I water each plant 1.5L per day, every 2 days.

If i were you i would repot them into a fresh compost mix without the worm castings.

The spots on the leaves look like nutrient burn but also could be your pot is too wet and too cold or could just be from transplant shock.

Maybe observe them for another week to see what they do.

 

[exoticrobotic]

Post a whole pic of the plant. How old is it?

Edit - Ahh i see 1 week old clones.

 

[exoticrobotic]

Also, although not really necessary, but if you are using Biobizz compost i would use their feed line too.

Or switch to Canna compost. I use that compost and it's pretty good.

 

[GrayZone]

Maybe observe them for another week to see what they do.

Ya, I agree. It may be too early to pinpoint, but I'd rather keep alert than end up with more issues.

They're probably shocked by the transport, putting them in soil, more light, and the new environment. The soil might also be too hot, and me stupidly (already) adding nutes might have burned them.

I think I'll flush them with only water next time and I'll see how they'll be in a week or so.

Changing the medium, yeah, I can do that if it gets worse, but for now I'd rather keep an eye on them and water them without adding any nutes. Rhizotonic and Hesi's SuperVit shouldn't hurt, but no CannBio Vega until they take off.

 

[Creeperpark]

Your soil is holding too much water for too long. Make sure you allow the soil to dry on top well before adding more water.

 

[Dime]

I would water sparingly until they make fresh roots and bounce back then wet/dry cycles almost to the point of wilt.jmo

 

[GrayZone]

Good points, thanks.

I'm using textile pots for the first time. Seems they dry up faster than your regular pots, so I might have watered too early cos of that.
Also, first time using bio-nutes and I've seen here people saying you shouldn't leave soil to dry out completely if using bio stuff. So I might have jumped the gun and watered too early. I've seen signs of overwatering shortly after I watered for the second time.

My first grow after a 15-year break. Guess I got rusty

 

[GrayZone]

So in case anyone stumbles into this thread and has the same issue;

Yeah, seems I managed to be overly enthusiastic with my bio stuff(castings and bio canna), and I managed to burn them. There's this "you can't burn the plants with biofertilizers" talk, but that's not the case with seedlings and young clones.

I've flushed them with water, only supervit and rhizotonic added, and they're doing fine now. Still a bit of burned tips, but as they grow and get another flush, that shouldn't be a problem, it should go away.