Depending on the plant of course - in winter all of it.
yes because a plant need soil but not a that much soil
about 6 cups of soil
Probably in soil because if you have too much water it will die and living in water is worst soil helps plants develop and it is better for them to have soil. I suggest you put soil. Plants probably grown bigger in soil.i mistake plans grow better in water
Bedrock
by the amount of it in the plant and how much sunlight it gets
When planting any plant you need to compress the soil around the plant. Not too much just enough so the plant cannot be pulled out (or blown out)of the soil easily.
YES!!California has rich soil. you can pretty much plant anything.
residual soil
21 Tonnes (approx)
no
i think so
Plants collect water from the soil beneath them through their roots, to be used in photosynthesis and growth.