Are my grassy plants dead?!!!

You'll have to wait I'm afraid. I'm not sure which type of grass this is. Some require cutting down each spring (probably about now), this one looks like it needs cutting down now to a "hedgehog" before new growth appears. I know this is the case for Fountain grass (Pennisetum Alopecuroides). becoz I've just bought one!

Silver spider needs cutting with secateurs down to ground completely and Pheasant's tail grass just needs raking or fingers running thro' it to remove last years spent flowerspikes.

Hope that helps! Google or ask is great!

This looks to me like a Miscanthus - does it have (or had) feathery seed heads? If so, it's defo Miscanthus and it needs to be cut down to, as Craftnutter says, a hedgehog. It will regrow from ground level each year. If you don't cut it down it just looks messy.

I thought it was supposed to get the feathery head but it never did! I will get my secatares out and start making hedgehogs!
Many thanks