@user78262102928 we planted daffodils in an area of our garden where there is a group of trees and accept that the grass will just get longer and longer up until around June when we strim it all back. The grass looks very brown for about 4 weeks but soon recovers.
snowdrops and crocus likewise - we mow round them, they have normally died back by April/May before the grass really grows strongly but it looks nice to have them naturalised and a bit "messy" for a while. By May I'm fed up of the messiness and glad to get my lawn back 
Last Spring I dug up a lot of the snowdrop clumps as they do get congested, and split them up and replanted them "in the green" spread them around the outside of a willow tree.
I also bought a further 300 singles and doubles to boost the coverage - they came from Parker's (online) on special offer. So it will be nice to see if they come up well in Spring, although I'm preparing myself for a big disappointment as sometimes in Year 1 after disturbing them, they don't always flourish, Year 2 can be a lot better, when they're fully settled.