I think a little hay smell is normal as shit breaks down during drying... I've never had it smell like straight hay, it always stinks up my whole area to the point I fear thieves lol... I'd say if it smells like hay after a few days curing... you probably fucked up drying. I'm always impressed how fast smells develop and improve during cure. Also depends on the
terpenes cause they all act differently. I hated the smell of my widow a month ago, but it's finally starting to smell good. Drying and curing are so important... and so easy to fuck up lol. There's more hay smell if you leave all the foliage too obviously, cause all that chlorophyll breaking down gives off that smell... or some scientific shit like that