I have awful clay to I raised my beds dug out the worst of the really big lumps of clay and filled it with topsoil from the other half of the garden that had been worked grit works a treat.
For your parsnips, what I would do, is use a crowbar to dig a hole a couple of feet deep about parsnip size, fill it with compost and plant you seed in the top. A bit like growing them in a drain pipe but without the pipe. They should have no problem pushing through the compose and only get restricted by the walls of clay. I had grew carrots in drainpipes last year fo exactly the same reason.
For your parsnips, what I would do, is use a crowbar to dig a hole a couple of feet deep about parsnip size, fill it with compost and plant you seed in the top. A bit like growing them in a drain pipe but without the pipe. They should have no problem pushing through the compose and only get restricted by the walls of clay. I had grew carrots in drainpipes last year fo exactly the same reason.
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