They build the houses on clay soil that you could, make into bricks then dry them in the sun and build additions to your house, pave your driveway make flat ones and you can tile your roof with them plus hundreds of other uses.
But in its virgin unprocessed state a plant cant penetrate it with its roots. I am known as a bit of an eccentric because for years now I have an electric golf cart that has been modified into a pick up truck with a towed trailer. Every Wednesday I go through the neighbor hood and pick up the yard waste that is put out for pick up by the city I always have at leas1 six foot compose pile going ok rarely is it just one pile. My yard has had this compost roto tilled to a depth of 3 feet in the soil. Where I grow my tomatoes I dig a six foot deep almost 4 foot wide hole fill with dirt I make my self that black rich full of worms healthy dirt. I can say most of you have never tasted a real tomato in your lives or a strawberry you would probably be depressed if I gave you one of our tomatoes or strawberries knowing you would never taste any thing that good in your life. I could not even choke down one of those things the store calls a tomato not even a so called vine ripened $3.49 a pound ball of yuk and strawberries you put whip cream and sugar on them because they are crap and you need to cover the taste Ours a truly a taste of heaven. I pity you all for the so called fruits and vegetables they sell at the store. I guess it is like a guy I new from Kansas it is so flat and boring I would have blown my brains out he replied so would I if I had known o any thing better. It is fun seeing who can grow the biggest pumpkin with the neighbor. There easy to grow and grow huge but taking down the side yard fence to get them out front is a hassle almost as big as moving them. And you buy seafood from the store you poor things. I would send each of you free samples except I would hate to see a sudden rash of suicides by forum members.
Dave S