We've been in our new house for 6 months and I've very belatedly had a thought. I am a MPC grower usually so I am useless with 'proper soil' 
Our house is built over a coal seam (no idea how deep down it is) - the soil appears to be quite heavy, not fully clay but definitely heavy and clumpy.
My question is... will the coal seam affect the soil? Do I need to be careful of what I grow directly in the soil or what I add to it?
If it helps... there are several rose bushes which are growing immensely (one goes all the way over the roof of the house!) - I tried to research what soil suited roses and got loam - I definitely don't think its loamy!
Help?

Our house is built over a coal seam (no idea how deep down it is) - the soil appears to be quite heavy, not fully clay but definitely heavy and clumpy.
My question is... will the coal seam affect the soil? Do I need to be careful of what I grow directly in the soil or what I add to it?
If it helps... there are several rose bushes which are growing immensely (one goes all the way over the roof of the house!) - I tried to research what soil suited roses and got loam - I definitely don't think its loamy!
Help?

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