jacks 321 should i add for when i plant the seed or best to provide just straight ph’d water until sprouted ?
btw using foxfarm cultivation nation coco coir/perlite 70/30 mix no soil
It depends on what soil you are using. Many soils types don’t need added nutes for the 1st 4 to 6 weeks. Certainly do not feed them until the cotyledon leaves are gone.
Get a PPM meter and begin feeding your plants when the runoff PPM dips below ~1,000 and maintain that level throughout the grow.
1 Like
do you have a suggestion of a good type of epsom salt i should use with the jacks
1 Like
An unscented will work. Many brands have additives. You want to use pure magnesium sulfate. Check the ingredient label before buying.
4 Likes
Some of us have dropped the Epsom from the mix. I have better looking plants now that I leave it out. @Myfriendis410 does this too.
But if you use it any that say Magnesium Sulfate USP as the ingredient and nothing else will work.
In Coco, which I also use, water the coco with full strength mix and let it drain and then plant your seed. You can go several days in a solo cup before it needs watering again.
3 Likes
im using foxfarm cultivation nation coco coir/perlite 70/30 mix no soil i think it already has nutrients so idk if i should it seems basic nutrient wise but might just be my inexperience lol
https://www.amazon.com/gp/product/B08SHYQQC8/ref=ox_sc_act_title_7?smid=ATVPDKIKX0DER&th=1
Its Coco and perlite only. No food,’
A seedling will live off its cotyledons for a few days. But feeding from the start is best.
If you’re afraid you can start with a half strength mix. I do that sometimes.
2 Likes
I still use Epsom with Jack’s. I do a modified version for the first three weeks of flower: 2-2-2-1.2 of MKP until day 21. Then back to the 3-2-1 ratio.
2 Likes
Sorry, thought it was you. But I have left it off for this grow and it looks good.
I know the formula for garden plants has no Epsom.
Btw, I tagged you into another thread on runoff question.
2 Likes
I know @AfgVet has discontinued using Epsom. I just feel that I need plenty of Mg and C when running coco.
2 Likes
Not arguing by any means, I guess the reason it works without is Part A is 30-35% Magnesium Sulfate already. So adding more for cannabis may be because its a heavy user.
Anyway this run is an experiment to see what happens.
I had no sign of an issue in my plants until about three weeks into flower. Then the magnesium deficiency came out in a big way. 
GGG breaks it all down.
The magnesium and calcium are covered without the epsom. I ran it in coco and for once didn’t have a Cal/mag deficiency at the end of stretch.
2 Likes
I run jacks and silica in coco. I start with about 1.5ml of silica in the beginning. Upping it to 4ml come flower. But the Jacks I use at 4g Part A, 2g, Part B, but no epsom. Well, not no epsom. I’ve added it like twice over three grows.