It might be more difficult than that
I suspect it'll be rather difficult to grow any plants directly in the Martian soil. From what I've seen, I doubt it has any of the nutrients that plants require to live. Soil on Earth is created through a long process and I don't think the same processes are present on Mars. There's also the thin air that leads to wide temperature fluctuations. There's also a problem with internal water boiling off due to the low atmospheric pressure. There isn't much moisture on Mars either.