Weeds and Leaves collection

CheChe and KorKor are funny. And loving. They will often return from the park or even just outside our house compound pick up leaves or flowering weeds for Mama. It's funny. But it's really sweet. CheChe will even put the weeds in a small container of water to keep them alive. Obviously not realising that they are weeds. KorKor will pick different coloured leaves and I will admire the colour and shape and veins and any other markings on the leaves with him. After that, I really don't know what to do with them. I ant bear to throw them just yet as that will hurt their feelings but I don't want to keep more bits and bobs in the house. Maybe I should have a tray somewhere for this and bin them when they finally seem that they belong in the bin, somehow....