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Each weekday Marshall Brain answers questions submitted by the readers of How Stuff Works in the Question of the Day section of HSW. You can also view previously answered questions in the HSW Question Archive. Here is today's question!

Question
Can grass seed grow on a lava rock as well as it can grow on soil?

Answer
Grass seed will grow almost anywhere - you may have seen it coming up through cracks in the sidewalk, for example. A fertilizer company once wanted to demonstrate the quality of its products so it sowed one of its parking lots in grass and it actually did quite well! As long as a plant has enough water and the proper nutrients, it will grow.

If you take take things to an extreme you arrive at a technique called hydroponics. In hydroponics, plants are raised in a nutrient-rich solution. There are actually a number of advantages to raising plants this way, because you can precisely control the nutrients the plants get and eliminate most soil-borne diseases. To learn more check out An introduction to Hydroponics and an Introduction from Hydrofarm, which has a nice library page.


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