Seedling?

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Washbasin7744

Member
Any ideas what's going on with my seedling? It's growth has kind of been slow since it's popped.

It germinated on the 18/04
It later popped above soil on the 20/04

When it first popped above soil, the grow tent was reading about 32c, however, later on I installed an ac to bring it down to 26c.
The RH is between 65-80% consistently.
It resides within a 30 gallon fabric pot that consists of 30% peat, 30% perlite and 30% ewc (worm casting and bunny guano).

I'm using a 720w LMH301 LED.

I've been mildly spritzing with water on the top soil, every 3 days.

I have three other seedlings that have popped around a similar time, one other one has the same yellowing.
The other two are green.
 

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lungbutter

lungbutter

Well-Known Member
It could be light burn, magnified by the water droplets, although you really shouldn't have them under a powerful led at this stage, you might get away with it if dimmed and far away, but i would personally stick to floros or small 10w led bulb for seeds.

Compost could be too strong also, i tend to start them in inert medium like peat puck after losing the occasional seeds to seed compost that was too hot.
 
W

Washbasin7744

Member
lungbutter said:
It could be light burn, magnified by the water droplets, although you really shouldn't have them under a powerful led at this stage, you might get away with it if dimmed and far away, but i would personally stick to floros or small 10w led bulb for seeds.

Compost could be too strong also, i tend to start them in inert medium like peat puck after losing the occasional seeds to seed compost that was too hot.
Click to expand...
I've got the lights dimmed way down (it's roughly at 250 PFFD), It's strange since the seedling emerged with it cotyledons yellowing from the start. I started it in a cup filled with 50/50 peat and perlite. However the root started growing out of the cup so I transplanted it into the final pot.

I've already lost a few seeds... Off to a rough start using peat pucks, they just didn't work for me.
 
lungbutter

lungbutter

Well-Known Member
Washbasin7744 said:
I've got the lights dimmed way down (it's roughly at 250 PFFD), It's strange since the seedling emerged with it cotyledons yellowing from the start. I started it in a cup filled with 50/50 peat and perlite. However the root started growing out of the cup so I transplanted it into the final pot.

I've already lost a few seeds... Off to a rough start using peat pucks, they just didn't work for me.
Click to expand...
one medium that always works well but is abit more expensive is the biobizz light mix compost, other companies make the similar, perhaps cheaper.

With the peat pucks ive very rarely lost a seedling, my method is just to sit them in tap water for a few hours, add the seed and put them on a plate on the window sill until they have leaves.

The yellow cotyledon i have seen before, i suspect it may be some early toxicity like too much nutes, a lockout or ph problem.
 
Hugo Phurst

Hugo Phurst

Well-Known Member
For future reference.
Some seedlings do fine with nutes & light, others not so much.
Got a dome & heat pad? They're not absolutely necessary, but very helpful.
Light - ambient/indirect light is best for seedlings, and they don't need food until the cotyledon have started to wither/yellow.

I'd move that girl out of the light till she greens up somewhat but remember, damage is done and it'll take time to recover & may be stunted.

Good luck
 
W

Washbasin7744

Member
lungbutter said:
one medium that always works well but is abit more expensive is the biobizz light mix compost, other companies make the similar, perhaps cheaper.

With the peat pucks ive very rarely lost a seedling, my method is just to sit them in tap water for a few hours, add the seed and put them on a plate on the window sill until they have leaves.

The yellow cotyledon i have seen before, i suspect it may be some early toxicity like too much nutes, a lockout or ph problem.
Click to expand...
Unfortunately, no biobizz where I'm at... Pretty much local sourced organic inputs only.

It seems that when I would do it, the peat pucks were very compact and the seedlings would have a hard time pushing out. It also dries out pretty quick. With the solo cup I've had a lot more success :mrgreen: All four seedlings I've germinated have grown to a small extent.

The yellow cotyledon is weird, since the other seedlings aren't exhibiting the same coloration. Yesterday I gave a light watering, and this morning I already saw a some of growth on the second set of true leaves; they were completely green.

Hopefully it will makes a swift recovery and start growing at a decent pace. Luckily they're photoperiods and I've got time.

I'm not completely sure how much I'm supposed to water them, I've tried today saturating the pot a little more with water since it felt pretty bone dry. I also tried using one of those water meters it came up with DRY+.
 

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Washbasin7744

Member
Hugo Phurst said:
For future reference.
Some seedlings do fine with nutes & light, others not so much.
Got a dome & heat pad? They're not absolutely necessary, but very helpful.
Light - ambient/indirect light is best for seedlings, and they don't need food until the cotyledon have started to wither/yellow.

I'd move that girl out of the light till she greens up somewhat but remember, damage is done and it'll take time to recover & may be stunted.

Good luck
Click to expand...
I haven't added any nutes, it's all been organic, just worm casting and bunny guano which shouldn't be hot at all for the seedlings to manage.
The temperature of soil is averaging 27c, so I think it should be find. I'll see if I can chuck on a dome.

Thanks for the advice
 
lungbutter

lungbutter

Well-Known Member
Washbasin7744 said:
Unfortunately, no biobizz where I'm at... Pretty much local sourced organic inputs only.

It seems that when I would do it, the peat pucks were very compact and the seedlings would have a hard time pushing out. It also dries out pretty quick. With the solo cup I've had a lot more success :mrgreen: All four seedlings I've germinated have grown to a small extent.

The yellow cotyledon is weird, since the other seedlings aren't exhibiting the same coloration. Yesterday I gave a light watering, and this morning I already saw a some of growth on the second set of true leaves; they were completely green.

Hopefully it will makes a swift recovery and start growing at a decent pace. Luckily they're photoperiods and I've got time.

I'm not completely sure how much I'm supposed to water them, I've tried today saturating the pot a little more with water since it felt pretty bone dry. I also tried using one of those water meters it came up with DRY+.
Click to expand...
Perhaps you haven't let the puck sit long enough in water? it needs at least a few hours, many do it overnight. Also you usually need to add a little water to the puck everyday (or every other day) as they dry out really quick especially if its warm.

Sounds like the yellow guy will be fine, perhaps a little stunted early.

One good method to tell if you need water is to feel the weight of the pot, compared to a recently watered pot a dry pot is very light. Its good to have a wet - dry - wet cycle in compost, its kind of like breathing.
Too much water will stop root growth and they drown, at this this stage they need to be encouraged to search for water and spread out.
Too dry and the compost will go hard and find it difficult to take up water, at that point you may need to sit it in some water and soak (a bit like with the puck.)
 
W

Washbasin7744

Member
lungbutter said:
Perhaps you haven't let the puck sit long enough in water? it needs at least a few hours, many do it overnight. Also you usually need to add a little water to the puck everyday (or every other day) as they dry out really quick especially if its warm.

Sounds like the yellow guy will be fine, perhaps a little stunted early.

One good method to tell if you need water is to feel the weight of the pot, compared to a recently watered pot a dry pot is very light. Its good to have a wet - dry - wet cycle in compost, its kind of like breathing.
Too much water will stop root growth and they drown, at this this stage they need to be encouraged to search for water and spread out.
Too dry and the compost will go hard and find it difficult to take up water, at that point you may need to sit it in some water and soak (a bit like with the puck.)
Click to expand...
Update, seems like the stunted period has finally come to a close. There's been some slow progress with the growth! Exciting!

I've been watering a lot more, I realised that most of the pot had completely dried out and turned white into a white powdery mix. This also caused the soil temperatures to sky rocket. I've been watering with a larger quantity 1-2 litres since it's a 30 gallon pot.

I've also added some nightcrawlers, red wigglers and mycorrhizae.

I was also of thinking of watering with some BTI as I've noticed some fungus gnats, however, I don't know if it will harm the seedling at this phase? Instead I've layered some diatomaceous earth on top for now but the BTI would work better.

When do you think would be a good time to remove the dome? Since the plant is hitting the edge of the dome.
 

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R

RockStonedJesus

Active Member
Washbasin7744 said:
@lungbutter @Hugo Phurst
Update since last thursday for the seedling, I think she's looking good?
Click to expand...
Looks great so far, good progression over the past few days.

Don't feed it too much, as you want the roots to grow and fill the pot.

Keep feeding centralized to the middle of the pot, directly below the stem.

As the plant grows, feed it more - don't worry about the medium drying out, as you want to encourage root development.

My rule of thumb is to feed the soil based on the diameter of the leaves - the bigger the diameter of the plant, the more you feed. I tend to feed the medium directly under the leaves, and as the plant grows bigger, you feed more of the pot. This has always worked for me to achieve amazing thick root mass very quickly.

Good luck, just don't over think it.
 
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