To grow trees will cost you 6,000 to 10,000 for the equipment. Depending on the size you have to grow. Each plant is given 6 sqft of floor space or more and you need a min of 8' ceilings 10' is better.

The experience level is above 90% of the people growing today. Its a full time job growing at that level and you need money to start and maintain the grow.

You can build a closet grow or a room grow for only 4 plants but that will still cost you about 6k for the parts and equipment. Even 4 trees will need at least 6k worth of HPS and 2k worth of MH light and the power to run them.

12-20 ton AC system to keep them cool, CO² generator, fogger for humidity, dehumidifier if it gets to high. Over sized exhaust and scrubber to clean the air. High volume chillers to keep the water res cold at all times. Very large air pumps (and they donâ??t use air stones) the air pipe that is used cost 22.00 a foot but it worth the money if you are growing KBS style. No clog and millions of bubbles.

Water filter system for the feed line and to make RO water. You will use about 50 gallons a week.

Nutrients well to start the setup cost over a grand and even up to 1500 for everything.

Controllers for the environment is about a grand each and you need 2 of them. In fact you need to double most of the equipment so you can have a veg room and a flower room or your total time is over 120 day's between crops. You can take the time down to 90 day cycles if you have a veg room, flower room, mother area and clone area.

Guess you need the whole house while you are at it or a very large warehouse.

All it takes is money.