Sawdust makes decent compost, but only if it is fortified with nitrogen. A couple handfuls of ammonium sulfate per cubic foot of sawdust is usually enough.

You could put a small amount in with the regular compost, fresh or partly decayed, but not too much as the fine particles will restrict the air movement in the bins.

Tug, do you mean this mixture of ammonium sulphate and sawdust left to compost on it's own or this mixture added to compost heap in small amounts?
Thanks Bulbaholic, looks like I shall have the sawdust for a very long time at that rate!

Either way, Lily, though if your compost has a lot of green material the sawdust will need less ammonium sulphate.

OK Tug thanks for that.

Yeah agree with all that but would suggest having a separate pile so you can see when the sawdust has properly broken down.

If it goes on the ground when not properly decomposed it can cause the tie-up of nitrogen for a while so any plants going in immediately could suffer. Presumably why Tug mentions fortifying with nitrogen.

Suggest looking up "nitrogen robbery" on the internet.

Thanks for your comment John, I'll google that as you suggest. There's so much sawdust that I shall need a separate pile for it as well as the usual compost bin. Otherwise it will be hanging around forever if I can only put small amounts in with other garden waste.