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Please edit and move to the Plants group, thank you.
Are tricky to identify beyond the "it's a Blackberry" stage.
They usually produce seeds by means of apomixis - roughly equivalent to cloning. So each plant produces identical offspring, and gradually these evolve different characteristics, so are virtually sub-species. Hence the "agg" in the systematic name. Over 400 microspecies are listed in the UK.
An old folk-tale has it that when Satan was cast out of heaven, he landed in a bramble patch. For this reason, some would not pick fruits are not picked after St. Michael's Day (29 Sept) because he had cursed them. This may have been a way of preventing people eating rotten or partly-fermented fruit.
Lat/Lng: 51.5, -0.2
OS grid ref: TQ2786