I have noticed this plant growing near my fruit bushes and it is spreading. Its leaves are shaped like arrowheads and have black splotches on them.
Is it a weed or friendly plant?
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It's Arum maculatum - this plant sometimes has these black markings on the leaves, sometimes doesn't, but either way, the berries it produces in autumn (fall) are highly toxic. There aren't many cases of poisoning from it though because they burn the mouth so people spit them out if they try them. The sap can be extremely irritant to the skin, and all parts are toxic, but this plant occurs in the wild and in less cultivated parts of gardens all the time, and is classed as a 'wildflower'. Common names in the UK include Cuckoo Pint as well as Lords and Ladies.
More info here if you're interested