Help with Nutes?

So i have had about 8 plants for 2 weeks now they are about a foot and a half give or take alittle, and I was wondering when I should start giving them nutrients for the growing stage? let me know ppl thanks
 
what kind of soil do you have? most soils contain the correct amount of nutes for the plant for about 3 weeks-month. sometimes more.....
 
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