Can you please offer some advice.

I have had a dustbin full of leylandi (conifer) shreddings for five years. It's now rotted down to a lovely crumbly mixture.

Is it going to be too acidic to use as a mulch; even on acidic loving plants?

Would it be better to dig it in, or to mix it with something else?

Any suggestions gratefully received - it seems such a shame not to use it.

Regards

Susie