Buttercups.

[cupid04]

I haven't seen any buttercups on my lawn for a few years. Anyone have an
explanation for this? Still get daisies, dandelions and clover.

[FredPuli43]

That is odd (he says helpfully!) because I've noticed the same . I don't spray the lawn . It may be that they are susceptible to constant mowing and are living in conditions on any lawn that are iffy for them at the best of times and so it doesn't take much for them to die out. The meadow next door is left to its own devices at one end ; the rest is sprayed and grazed; that end is always a mass of buttercups (and a good many cowslips too), such that passers-by stop to take photographs.Evidently, it's not local conditions (or global warming!) that account for their disappearance here.

[cupid04]

Thankyou FredPuli43 for such an in depth answer.

[coccinelle]

I no longer have buttercups in the grass I mow but I do in the 'wilder' parts of the garden. I think like FredPuli says; they don't like being mowed down and just give up. This year I've noticed more cowslips in the 'wilder' parts too and on the side of the roads so a good sign.