Blind Daffs - what now ?

I have several clumps off Daffs planted in my lawn for over 6 years . They are lovely , I let them die down after flowering and mow them late May . Now one clump has produced all blind heads this year . Do I leave them , hoping they flower next year ? Or should I keep mowing them out when they show?

TIA

 

Hi Harry,
Aa they've flowered every year up until now I'd say the problem is that they've become too congested.

They probably need digging up and replanting in smaller clumps and then given a good feed.

The other main reasons for blindness are shallow planting and starvation, but, as yours have flowered before I think we can safely rule those out