For grass seed, it needs lots of water, and it has been a drought for a long time!
It needs covering up with fine soil.Unless you water it a lot, it won't grow, and yes, birds do take a percentage of it.
Hyrangeas can be made to change to blue, there are lots of things if you look in a garden centre.Sorry can't remember the names ( and I have two lots of it sitting in the shed.) 
Lest we forget what we have just lost ....
