I have plans on building a greenhouse, space is not an issue, the ceilings start at around 11 feet and peaks at around 15+ so height is not an issue either. I was wondering what size containers do you think would be optimium? I will be starting from seed and have them transplanted outdoors in the greenhouse when there about 4 feet tall in late april. What do you think? how big of buckets do you think would be optimum? i want the most potential. 20 gallons? 30? 50???