How early can you give it nutrients?

Yo will slowly raise your Hydro solution by 50-100 ppm to bring it around 600-700 toward mid to end of vegetation. So raise slowly to get the plant used to the nute and raise it has needed. Once in flowering you can start raising ppm up to 1000+ the same way while lowering your nitrogen in the cours of 4-5 weeks to a bare minimum.. and cut it out around week 7. Or 70% thru its flowering stage.. then slowly reducing nutrient till last week of flowerin to around 0-100ppm and ket the plant eat utself on last week of flowering just before harvest.. a slow wave going up and down of nutieent feeding with a few plateau...

Basically, if you're using fertilized substrate or not... If it's fertilized, wait two to three weeks, and if not, as soon as the second node appears... but only for the roots, for growth wait another week... At least that's what I dooo...

Depends what substrate you use . I use Coco and give a small feed of Coco and base nutes at day 5 👍. They get stunted if I don't give them some nutes .