Tried it .It will barely bud because there is not a good root ball. That's why 4 to 5 true sets of leaves. Good roots by then. No real roots before then. A foot or beter is good depends on your room. They double or more in size when flowered. Not so if the roots are not there.

Six plant , 1000 watt HPS. plants 12 to 16 inches. One pound.

Six plants , 1000 watt HPS started at 2 sets of leaves. 2 onces or less.