JBP Cuttings - Stalled, help!

JeffS73

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My JBP seedling cuttings have been a bit up and down in health, but some are finally rooting. However, quite a few either have the beginnings of roots or new roots that seem to have stopped growing.

Most of these roots are above ground - the stems withered/rotted either from the clonex gel I used or possibly from being in the growing media & closed propagator so long.

So, the roots are popping but they've just stopped growing or moving, what can I do to get them extending? I'm concerned because I've started to see mould on needles in a couple of cases, I don't want to spray them with anti fungal because I'm worried it'll be bad for the roots, and I don't want to open the propagators to increase air circulation in case the roots/root buds dry out. What do I do?

It seems like I'm close to having some great seedlings but I could lose them at this critical stage. Please help!

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Shibui

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Wow. Aerial roots on pines! High humidity!
I have occasionally wondered if too strong hormone can damage soft stems but really high moisture levels definitely causes stems to rot underground. Yours are really determined to survive. I have not seen roots above soil level in any of mine.
Fungicide should not inhibit roots. If you have fungal issues use fungicide before the fungal infection kills them off.
Stalled growth is likely to be a factor of the plants having to throw resources at new roots now. They will take off again when/if those roots get going properly and can supply nutrients.
I would also suggest that the humidity is way too high. Pines generally like it a bit drier. Your propagators should have vents and i would try opening them at least partly. Best to gradually increase airflow every few days rather than a sudden shift to much lower moisture.
If the only roots are above ground level I would consider replanting these so the roots are actually in the mix before reducing humidity. At this stage they will transplant no problem. Any deaths after transplant will almost certainly be from other factors.
 

sorce

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Introducing a larger media around the base of the trunk could help, if it's needed at all.
With tweezers.

Also, if it's that humid, the soil may never dry beneath the surface so those lower roots may be dying, which might account for the near dessication.

If that's not why they have been hanging in the balance it may have just been the rerooting stage, and the balance is back in your favor, but that balance needs sun and air!

nice.

Sorce
 

JeffS73

Seedling
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Wow. Aerial roots on pines! High humidity!
I have occasionally wondered if too strong hormone can damage soft stems but really high moisture levels definitely causes stems to rot underground. Yours are really determined to survive. I have not seen roots above soil level in any of mine.
Fungicide should not inhibit roots. If you have fungal issues use fungicide before the fungal infection kills them off.
Stalled growth is likely to be a factor of the plants having to throw resources at new roots now. They will take off again when/if those roots get going properly and can supply nutrients.
I would also suggest that the humidity is way too high. Pines generally like it a bit drier. Your propagators should have vents and i would try opening them at least partly. Best to gradually increase airflow every few days rather than a sudden shift to much lower moisture.
If the only roots are above ground level I would consider replanting these so the roots are actually in the mix before reducing humidity. At this stage they will transplant no problem. Any deaths after transplant will almost certainly be from other factors.
thanks, yeah, ive started to address the environmental issues. I was worried that reducing humidity would risk drying out the emerging roots, but with the bottom heat maybe that wasn't a big risk.

I've now got them in a tent with a fan & lids off, so hopefully they will get going again soon. Feels like I'm an icu nurse for pines, def need to improve methods for next batches..
 

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