Switching to 12/12 questions

mikethegrower

Active Member
Hi, I am about to flip to 12/12 and change my bulbs to hps and had a couple questions. I am growing in pro mix and perlite under 600w mh and have been vegging for 9wks. I have been doing feed, feed, water and the plants look great. My questions are, do I give them a dark period before going to 12/12 and do I just continue on with my feeding schedule switching from vegging nutes to flowering nutes? Thank you
 

doniawon

Well-Known Member
So would I continue to use veg nutes till then? What is the reason for this? Thanks
yes. continue with the veg nutes until you see bud sites forming, then start using either a mix of bloom and veg nutes, or straight bloom nutes. If you switch too early the plant will run out of stored nitrogen which will cause the leaves to yellow and die prematurely. Your plant wont want or need the extra pk till it starts packing on the bud sites.
 

mnmobbin

Well-Known Member
Promix can be made yourself for a LOT less $$.

Canadian Peat
Perlite
Epsoma Plant tone
http://www.espoma.com/p_consumer/tones_plant.html

And 2 tablespoons of dolomite lime per gallon of mix.

It's also organic, and you can still use your nutes but you won't need nearly as much if you up the plant-tone a bit.
hd, lowes or menards has pro-mix for $10-13 a 4 cubic foot bale. Thats pretty cheap. I use it as is in airpots but in a standard pot id add a little perlite to help with drainage.
 

Sunbiz1

Well-Known Member
hd, lowes or menards has pro-mix for $10-13 a 4 cubic foot bale. Thats pretty cheap. I use it as is in airpots but in a standard pot id add a little perlite to help with drainage.
Not anymore, was just at Menards and they pull almost everything off the shelves for the winter...had to dig around just to find a few leftover bales of peat.
 

zack66

Well-Known Member
I don't do any dark period. Just switch to 12/12. I feed a combination of grow and bloom nutes when first switching. I'm 5 weeks since switch to 12/12 and still giving half tsp of grow nutes. Pretty much done now using grow. Keep em green!
 

Sunbiz1

Well-Known Member
damn I just bought 3 bales should of grabed more!
Yep, I got caught with my pants down last winter on perlite...HD, Men, and Lowes all pull that stuff away when they set-up for Christmas.

So this year I cleaned Menards completely out of it. You might get lucky if you check around though, Lowes tends to store a lot of stuff outdoors all winter way in back.
 

Sunbiz1

Well-Known Member
Hi, I am about to flip to 12/12 and change my bulbs to hps and had a couple questions. I am growing in pro mix and perlite under 600w mh and have been vegging for 9wks. I have been doing feed, feed, water and the plants look great. My questions are, do I give them a dark period before going to 12/12 and do I just continue on with my feeding schedule switching from vegging nutes to flowering nutes? Thank you
Sorry, got your thread here off-topic. Yes, simply flip and switch nutes(no darkness). However, double-check your flowering nutrient label for N. Some of those blends contain lower amounts of nitrogen...too low actually. Since you are growing soiless, your plants depend almost solely on whatever products you are using.
 
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