[...] I don't grow Exochorda as the flowers only seem to last a week or two
Really? My Exochorda × macrantha 'The Bride' flowers from mid-March till end of April. Here's a photo taken this morning illustrating its other name of "pearl bush"! A truly lovely bush.
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I sowed the last lot on the 1st August 17, they flowered last year.
I bought thesehttps://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItemVersion&item=273771814344&view=all&tid=2131343088017