Postcard to his Wife

'The dulcamara of memory is not enough' —> he doesn't just want to remember his wife, he wants to see her again. 

'Make excuses' and 'anything! But come home' in the second and third stanzas sound like Abse is desperate to see his wife and he's pleading to see her again. 

'Cant make Abse's heart grow fonder' could suggest that his heart can't grow fonder for her because he knows that she is not alive and not coming back.