Why Are My Plants Growing Slow???

I got 4 wwxbb 3 purp wreck 3 whitew and 1 Og kush 3 critial + 2 diafem cheese and they all seem to be growing slow i got a bubbas gift thats like 5-6 weeks from seed and looks like its 3 weeks but i top it few times tho i use pro mix what can i add or mix in my soil that would help that i can buy from lowes or home depot or even online i usually use ffof but the pro mix was easier to get n thought it was good soil any info you got that can help me out would be awesome thanks

Ensure your temps are up to 77F -ish?

light coverage is good and the right temp(K)

I would have gone FFOF and 30% more perlite

thats what you get for cutting corners lol

good luck

Well i thought pro mix was just as good and i use a bunch or perilite in my soil and my temps are usually from 70-81 through out the day and i water every 3-4 days

what about your topping the plant. That can slow it down drastically depending on how and when it was done...you've always topped this early on (whenever it is you did) and in the same manner?

I usually top at like 2 weeks or so but the plants i got going i havent top yet and they seem to be growing reallt slow ill show pic i planted all these on 4-6-16

I see peoples plants at 2-3 weeks and are 4 times bigger than mine even when i use the good ffof soil they still grow slow.well it seems like they are i have a hollister kush that i let grow out wout topping n its small i flip to 12-12 thinking it would grow a good bit before it started to flower and its same size but smells awesome