6 plants in 5 gallon buckets under a 1000w mh for 1 month and 1000w hps for 2 months with good nutes and care your plants will end at 3-4 feet tall-plus the bucket height... i say put 3 gallons of soil in the bucket ,top your plants for sure.. use bud blood for first 2 weeks of 12/12,keep the mh...