My 1st post - Something from the garden

[Achebe]

What would it mean to she who passed   ... to her
a single room with a lamp left on?    
If two lovers wandered out into their garden         
to live where twilight lives after dark.   ... 'to live' not needed?
And sit among the leaves and flowers late to bloom.  ... sat
where the wild rasberries grow.    
Like chords from the string,     
only speaking of inconsequent things    ... inconsequential
When he writes, he'll think of her constantly.   
And she, understands what the writing means.   
All he may mark would be his own,    
offset by what is hers alone.     

Hi Ir3, some minor bugs pointed out above.
The question at the start is never answered. It's not obvious enough to be rhetorical, so it just hangs there like a loose thread.
The final four lines are wordy. I've read them several times, but can't understand what you're trying to say. The juice isn't worth the squeeze.

Overall, some nice atmospherics, but rather incoherent.