Soil Help

Hi I have a very large spring that I am digging out soon so I can have a fish pond. Will the the soil thats in it be good for my ganja? Is there any test I can do to see. Soil testing kits to see whats in it. All the hippies in my area want some for there garden but that doesn't mean it will be good for pot plants. I have around 200 medical plants going in the ground this summer so I want to get the best soil with out having to buy 200 bail's of pro mix. The soil is dark rich looking looks good but Im new to this. I usually just by the pro mix and go. Let me know if you need any other info on the soil and I will see what I can do thanks

Here are some pics if they are any help

You need a water test first off. Many state ag schools have the ability to run soil samples. The soil surrounding the spring is sure to hold an excess of wehatever minerals are present in the water - where do you think they come from? From the soil and into the water.

And this soil is sure to need work before being used to grow anything. Organic materials are often lacking or are so waterlogged they never decomposed properly. Not saying it's no good - just saying don't count the mature plants yet.

That soil looks AWESOME!! If you're in the US, take a good sized jar of it down to the nearest Ag Office (USDA) or University Ag ext. and they will do an analysis of it for you. SHOULD be free, but hey, the Gov't needs more money don't they? Once you get the stuff away from the spring and water source it should dry out well and be just fine as long as it has both good water retention and drainage (away from that constant water source). Your Ag agent should be able to tell you if the structure is good or not. Also they can analyze it for macro & micro nutrients and tell you exactly what you should add to it. If the "Hippies" say it's good for their gardens, go with that! MJ is just a plant, in fact it grows naturally in some pretty hostile and barren environments. Why do people think it's so fragile? We pretty much have to try to kill it, and look where that's gotten our gov't so far. 50+ years of eradication program and it's STILL going strong.
I always suggest using native soils rather than other alternatives, as it already has a well established mycorrhizae and bacterial colony native to the area, but some folks are hard headed or they just like having the Gucci or Prada equivalent of soils and nutes.

Thanks for the advice I live in BC Canada so going to the Ag Office is a no go. Today I bought a test kit to tell me the ph, NPK levels of the soil. It should have good water retention as its been in water its whole life. If not a lady at the grow store said to add peat moss.It has had 100 years for sure of leaves falling and things breaking down in it for years.The water is also constantly moving as it slowly drains into a river on the other side of my yard. so I hope its as good as it looks. As you know soil choice is a major decision to make and I would like to make the best one with out spending $6,000 on dirt that I have in my own yard!!!

I think you have the best soil right there in your own backyard. I got clay! hard RED Clay. But hey, clay boosts the CEC