Afterlife

[Achebe]

This is how they come to haunt us,
to make us remember, how they keep a foot
in our world, the way we hold on.

You'll be asked to spare some change 
by a man in the supermarket,
who smells of sweet sherry and Sunday roast. ..... although this is a lovely image, it's unwieldy. Maybe breaking it up as 'You'll be asked / to spare some change' provides the necessary pause

As you kneel in the garden
to tie off daffodils you'll remember that ...again, daffodils / you'll remember might be smoother
she showed you how to do it. 

You can't avoid that shock of grey hair ....could do with a little change here from three successive 'You's. 
walking up the hill with her shopping bags
as you drive past and think for a moment it's her.

There isn't any dark underbelly
or shadow clad evil waiting to drag us kicking ...and again, or shadow clad evil / waiting
into the opening roots of a bloody tree. .... great image.

But sometimes you'll hear your name being called  ..
when you play music too loud and turn it down
to listen for that voice once again. ... splendid

 

One for the ages. A bit wordy, so perhaps you should give it some thought.