How to avoid mold on seedlings?


Carnivorous Plant Addict
Hi all,

On my seedlings grown on dead sphagnum, I have some gross green jelly.
It's not arming the plant but I'd like to get rid of it.
When the seedlings are bigger I top with live sphagnum, but as the sphagnum grow faster than the seedlings it's a "battle for light".
I could also repot (again!) but some seedling are really small or fragile and I don't want risking loosing the plant.

Here is some pictures:

N. Stenophylla (3)

N. Tentaculata (1)

I also have N. Philippinensis (1) and N. Burbidgeae (1) but they are really tiny and slow growing...

Lloyd Gordon

Parasitic Plant Aficionado
Staff member
I get that too, but not all the time. I think it's algae, It's yucky looking but not toxic. I think it may smother the seeds/plants when it's thick so I wipe or pick it off or repot as needed. If you "float" the roots out with distilled water, the root damage is minimal.


I've been getting the same with my baby nepenthes, I've been repotting them when ever this happens, but don't think this is the best way to go...especially long term.

Ive been told to increase ventilation, which is what I'm trying next.


Carnivorous Plant Addict
I'll take it out but as it will come back, I'll maybe try some toping...
I don't have sand but crushed Perlite could do it... or maybe 2 mm of peat moss as it grows moss on it?
Anyway! Thanks for your input.


CPSC Moderator
Staff member
It looks like algae, I find that it doesn't happen as often if you wash your LFS beforehand. Increased ventilation will help reducing algae and fungus growth.


Carnivorous Plant Addict
In my case, filamentous molds disappear when sprayed. But this jelly stays.
Aeration... yes, should do but I use the Mondi mini greenhouse and the vents are opened at max.

Do you suggest me to make a bigger aeration to boost the ventilation like cutting a hole?


Carnivorous Plant Addict
Ok I got it.
To fight the filamentous molds I had to spray more and even if I have good drainage, the sphagnum was water logged...
I made it drier with new top sphagnum.
It should me better now.


This is against the grain but, you can try using spring tails. They eat fungus and mold. I have personally used them in this way a handful of times for my plants. I can't guarantee if it is the same for all neps. I will say this. I have spring tails cultured in a container with little to no air flow and the medium still smells fresh. Without springtails it will smell rancid in a few days.
If your in toronto i can give you some.

Also if you report, put more perlite in your mix. I use probably 50-60% coarse perlite

John Yates

Carnivorous Plant Addict
I have use dry fine sand to fix this problem, we rate it here as N40 or N30 grade from Slone sands here in Adelaide , the fine grade sand must be neutral PH of cause, the find sand sucks the life out of the slime ,used very liberally ,but best used when using peat & perlite or sand mixes as the media , used several times if needed , will work on the spahg just no effectively as other mixes ,lessen watering to be more effective ( no top watering ) with or in conjunction with increase light and air flow , this can be reasonable stopped quickly, if if persists , your light and air flow is not correct , change the position of the pot to a more productive spot can help to