Marijuana grow tips. Selecting an appropriate grow space is vital to you medical marijuana grow success. It can be almost any shape or size you just need to follow a few basic rules. The following applies to indoor growing. Start with a clean area. Cover floor, walls and sealing if possible in an easy to clean white or other reflective surface. Seal the space with tape and plastic if possible. Leave two openings for ventilation, one at the top and one at the bottom. Keep your electricity such as power strips you connect your components to above waist high as a rule. Keep all water such as humidifiers and hydro equipment below waist high as a rule. If possible have your primary electrical source (electrical panel, breaker, wall outlet…) outside of your grow space. Keep your grow space clean. Hope this helps you.