New grower should I prune my 4 week old plants?

You don't prune marijuana plants.

Ok so what should I do. They arent growing as tall as I hoped for?

Pruning will not make her grow taller. What are you feeding, and lights please?

Bushy as fuck, is a good thing. Yellow leaves might mean over fert.

We are using canna A and B we had over fertalised them and we have backed it back as we have realised we were giving them two much. There a three plants all the same height and they are under a 400watt Led light. Is just over 6 inches a good height for 29 days of light at 18hours on 6 off we thought they would be higher by now.

it all depends on where the light it, if u pull it up your plants will no recieve the proper amount of light and they will stretch towards it.

since you light is close, these plants have all the light they need and will be much more compact as they do not neet to stretch.

the right distance will provide the perfect combination of height and and density, this is your job to figure out by adjusting the light and seeing how the plant reacts over the course of a few days.

pay attention now.

chances are that your led uses even more wattage than is advertised as i have found out on multiple occasions.

but ya these lights emit all usable light for the plant, and it gets what is needs even if your light is farther away.


AND DUDE!!! THESE ARE LEDS!!!, they produce all usable light, and 400 watts is a lot for an led.
move your light way higher, i have a 560 watt veg light and i have 4 months old plants that were about 18 inches tall with about 30 branches each node was only a centimeter and a half apart...

i moved the light up to six feet after that for veg.

you definately want to grow more plants and cover more area.

look up the inverse square law.

it also doesnt help that your cuttings are probably from a small plan genetic.

or did u grow from seed?

and what strain?

i think u have a dwarf gene somewhere in here lol. no, seriously i got a drawf and the roots just are not the same as the other plants, way smaller and dont see to be flourishing as well, do u have any way to check your root zone for dry decaying roots?

I have 1 purple haze and two northern light skunks growing they were started from seed and they are femernised. We have no way of looking at roots without pulling them out of there pots.

Try some LST on those to improve airflow and allow the light to reach the inner part of the plant since its so bushy.