What a lovely blog post! Marion is right, Kate, you are lucky to have such an acute sense of smell linked to memory. It seems the stuff of poetry to me: have you ever tried writing about it in that form?
Marion, I love the idea of choosing your plants according to their link to poets and painters. What rich associations!
My associations are all visual ones.
Sweet William reminds me of my grandmother because they were her favourite flowers. Ditto magnolia for my Mum. Daffodils always remind me of my first ever trip 'oop North' for an interview at York University, because they were all out around the city walls. (I got in, by the way, and never returned South).
http://www.mandysutter.com/reluctant-gardener-day-95-weedkiller/
These are visual memories for me, though, not scent memories.