Not the greatest product are they. It looks like a mass produced version of what the more insane Railway modellers were doing thirty years ago. Looking at what they supply I think I’d ditch everything except the paper leaves. Use the flock you have found and dip broom bristles in glue, then into the flock, to make the Reed head. When they are dry, add the leaves around the head to make the complete plant. Once that has dried, drill holes in whatever you are using as the base and glue them in. They are going to be less than robust for gaming though…..