Oh no! Try corresponding with Lon R.- he has fruited jujube in Oregon, though I don't know if it was maritime, and might be able to help you! Might be you would need to pick your earliest cultivar, put it in a heat-absorbing pot in the most hot, sunny and punishing summer-like spot you have, with southern exposure and something to reflect heat onto the plant during the day and release some heat at night... just some thoughts. I know my jujubes have not liked being planted in less than the hottest and sunniest spot I have- they survived but never fruited if put in half-sun or a cooler spot. Sorry, but I hope there is still hope!
Greg
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