Lava Rock Made W/ Artificial Soil

Researchers have looked into how plants respond to low levels of gravity.
They're also researching a particular hormone that helps plants grow in tough space conditions.
They've succeeded in growing plants in high-tech planters by using artificial soil made from lava rock.
The goal of the research is to eventually find a way for plants to grow directly in water.
They want to do this by providing the nutrients supplied through the water instead of through soil.