Caterpillars or some other small creatures have been feasting on this patch of Nettle (Urtica dioica) , growing near the garden centre at the back of park Frankendael.

On a safe foraging note, I was sent this link today. Obviously anyone foraging should be conscious of their personal safety and some foraging hot spots are more secluded than others. There is apparently a women in this part of town who has mugged write a number of women, near the Park Frankendael, over the past year or so. She has been asking them for directions, or that sort of thing, then mugging them. A photo fit of her face is on the link.