When to add nutrients to clones?

Wait a couple weeks. Definitely wait until they have roots, transplanted into pots, and a few days on top of that to recover from any shock from the transplant. Any sooner and you might kill them.
 
My role is once the root system show's through the bottom of the cube/pellet.Then i would only add quarter strenth for the first week then harf for 2 week then full on after.Make sure that once you sort a ph out stick to it all the way through the grow.I always grow with a ph of 5.0/5.5 by sticking to the same ph you will not end up with ph flucktuations.When the clone's seeds are very young i feed nothing just water/1 drop of superthrive to every ltr of water.Make sure that you spray the leaves for the first week of a clones life this is it's only way of gaining any feed till the starter roots appear.A good feed for the 2nd week of starter roots is plant start.You may want a higher ph but i'm growing greenhouse strains.And if that is the ph and ppm the plants that they recive of arjon/franco that is what mine get i pull 5/6 ounce dry of a plant flowered at 1 and harf foot tall.hope this helped tyke.
 
Once they develop a root system they will begin seeking nutrients much more than they had been during cloning. I generally let the cutting root well, and SLIGHTLY yellow prior to giving it a dunk in a 25% nutrient solution... This should be just fine for you.

Don't try to feed the plant until it has developed roots, as it may ruin its chances of rooting all together.
 
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