NParks Talks on High Rise Gardening:

Sunlight

• Fluorescent light use as sunlight
• needs at least 2-3 tubes, 
• Plants at most 20cm lower. 
• Only Ferns can grow
• Turn your plants - Equal growth
• If your plants stems are long, they are asking for light. 

Wind and Humidity

• Group enough plants together
• Allows humidity. 

Soil

• Normal soil outside results in compaction over time
• Compaction squeeze out air and when you water, the roots drown. 
• Good quality potting mix should stay moist, aerated and well drain for a long period of time
• Nutrients stay on the surface of the soil particles - therefore u need the inorganic soil portion to hold it. The compost ( organic portion) just provide nutrients but they will just go away if there is nothing to hold it. 
• Start with Equal portions of burnt Eath and mature compost

Fertilizers:

• Apply when plants are hydrated
• Use less than needed when unsure.
• Correct way is to poke a hole then add it cause it can cause "burns" to stems

Water:

• Add enough such that the water drains.
• Finger test - soil below surface.