Seedlings keep dying after transplant from rockwool

chiqifella

chiqifella

Well-Known Member
Cold$moke said:
Ok if you gota sqeeze stuff go get RR as they are a sponge.

I like to sqeeze tities lol. But DO NOT SQEEZE WOOL AT ALL destroys the micro pores between the fibers

Rockwools doesnt biodegrade because its rock
Its already degraded lol. Just mash it up into your compost:) think of it as rock cotton
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look, the directions on the package instruct to gently squeeze excess moisture out of the cube before planting.
everyone knows you dont use a waterlogged cube.
doing so does not destroy anything.
of course it doesnt compost, and it looks like shit in my yard gardens too, those are my cube bads, personally.
 
MickFoster

MickFoster

Well-Known Member
What size container do you plan to use when you transplant? I'd put them in a solo cup with a 70/30 coco/perlite mix right now so the root can grow straight into the medium - cut off the plastic first.
 
chiqifella

chiqifella

Well-Known Member
Lucic1991 said:
Here is what they look like now. It is 90* F and 0% RH under the light. They both are pretty dry but with some slight moisture at the bottom of the cube. One has a root sticking out the bottom and one doesn't. I'm afraid to give them water because it seemed like they were too moist before, but they're pretty dry and I'm afraid to transplant them yet. Should I just mist them and maybe put them on a bed of pearlite so they can drain?
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transplant rooted one immediately to moist substrate and water it in. Completely bury the cube under substrate and be sure drainage is operational. water again when container is drier near the bottom.
90f and 0 rh is death fast btw. I'm out
 
L

Lucic1991

Member
I can turn on the fans to cool it down I just haven't yet because I wanted them to get a little stronger before turning on the fan. I planted them in solo cups last time exactly like that actually - 70% (canna)coco/30% pearlite with 1" of pearlite on the bottom and a drainage hole. I then transplant them to 3 gal buckets with the same setup.
 
curious2garden

curious2garden

Well-Known Mod
Staff member
Lucic1991 said:
I'm having problems with my seedlings dying after they sprout in rockwool cubes.

I have had a few successful grows in my basement grow room (it's finished, clean, and dry), but I've been having some problems my last three attempts. I start my seeds in rockwool cubes dipped in pH 5.5 bottled spring water, on the lid of a tupperware container with the top just gently sitting on top to trap moisture. I open it 2x/day to let air in and I have never had problems with the seeds sprouting. However, once they've sprouted, I transplant them and they have died the past three times. I use coco coir mixed with organic pearlite as a medium, with a 2" perlite bottom and a hole drilled into the 3-gallon bucket for drainage. I put my seedlings under a T-5 4-bulb light with 4 fluorescent 6400k bulbs that puts out 20k lumens for vegging, which I put them under once they've sprouted. (I have a 600W HPS that i switch to for flowering, but haven't gotten that far with my last few grows). I have a of small, indirect blowing fan, it's about 70 degrees F, 30%RH, I have a carbon filter, and no pests so I'm not sure what is going wrong with my plants but if anybody has any ideas I would appreciate the help! Should I be letting the seedlings sit under the lights in the cubes for awhile before transplanting? Am I transplanting them too early? Please help!
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I start my seeds directly in my coco coir/perlite mix. I go a little lighter on the perlite initially. Good luck.
 
Kingrow1

Kingrow1

Well-Known Member
Lucic1991 said:
Here is what they look like now. It is 90* F and 0% RH under the light. They both are pretty dry but with some slight moisture at the bottom of the cube. One has a root sticking out the bottom and one doesn't. I'm afraid to give them water because it seemed like they were too moist before, but they're pretty dry and I'm afraid to transplant them yet. Should I just mist them and maybe put them on a bed of pearlite so they can drain?
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Can i just say that there is no where on earth that has 0% relative humidity.

What you need to do is take the rh and temp meter and place them away from the light. Unshaded and in direct light you are simply reading radiative heat and this is no your real air temp or relative humidity.

Next after doing this you need to learn to read what the plants are telling you as to how close or far away from the light they need to be. Im not even sure humans would last a couple days in 90f and 0% rh let alone plants.

:-)
 
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