Allium leaves

LizaJ

Is it ok to trim off Allium leaves to tidy them up a bit or should they really be left until they flower?

fidgetbones

They need the leaves to build up the bulbs for next year. If you trim the leaves off, they will flower this year but probably not next year.   They start to look scruffy and die off as the flowers open. I find that forget me nots hide the scruffy bases.

LizaJ

I thought that might be the case but wanted to check, thank you!

fidgetbones

Nanny Beach

leave them alone both before and after they flower

AnniD

For next year, you could try planting something such as a hardy geranium e.g. "Rozanne" * in the same area. This will grow up to hide the dying allium foliage. 
That's the theory anyway 

* Many others to choose from.

bracken

The thing with Alliums is they need to be planted in amongst other plants so you don't see the leaves.   

Loxley

I planted Allium 'Gladiator' last autumn - bit of an error, the leaves are massive and emerging perennials are going to struggle to hide them.