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There are big old Monkey Puzzles growing in Victoria, but always as a single tree, and no others nearby.In the garden you photographed, there are a number of trees, which hopefully include both sexes. They are wind-pollinated, so don't need to be growing right next to each other. Do any of them produce nuts?
Good question Diane I don't know the answer to that but I will investigate and report back.
I would have thought that you would have noticed as the cones are trully huge - you certainly would not want to be hit by a falling one.
October storms, autumn fruits, falling leaves and more flowering bulbs all in this week's Bulb Log. (Attachment Link) https://www.srgc.org.uk/logs/logdir/2021Oct061633516551BULB_LOG_4021.pdf
You may try to place a flat rock over the Sternbergia bulbs. If you position the rock southwards, it will catch all heat in summer while keeping the soil dry underneath. When it is time to grow, the Sternbergia stems will find their way underneath the rock and leaves and flowers will come up on the ridges. At least that does work with me although I do not live that far North.