
So I'm digging out a big patch under the neighbours conifers where I'm going to put grasses and hostas but the old chap who lived here before us had a habit of dumping all the coal at the top of the garden... I'm getting out what I can but there will still be a lot left buried, will it be detrimental to the plants going in soil full of coal?
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I wouldn't worry but I would add plenty of well-rotted manure and garden compost to help plant roots get established and growing well. Gardens need to perform faster than re-wilding.