Apologies for the delay in adding this one to the website🫣 Despite it being one of my favourite materials. I previously had my eyes/nose set on a lovely Charabot variety, but of course that was collapsed into Robertet, which made it difficult to source. I've since tried many different ones and have finally settled on this one, which comes from a small French producer. 
 
The thing with hay is that although it has a botanical species listed (lolium perenne), often it's made using not a direct crop but farmyard surplus. This can lead to substantial variation between suppliers. 
 
With Hay absolutes the main dimensions of variation are:
 
Sweetness (caramel)
Sweetness (Coumarin/tonka note)
Animalicity
Fruitiness
 
This one is a good balance with less animalic vibes than some of the samples I smelled and more of the coumarinic tonka notes that make hay so useful in perfumery. It's also moderately fruity, not in a brash estery sense, but in a kind of tobacco-damascone sense.
 
It's also ultra powerful, almost black in colour, but still pourable. I recommend using a 1% dilution to start with to add traces to all sorts of compositions.