If you can't find any suitable dry tinder (grass, bracken etc) then an alternative is a bit similar to feather sticks ( they don't really work with embers) .... just whittle a nice big pile of (dry) wood shavings from a suitable bit of dead wood such as hazel or ash (or any wood which burns well), oak works too, place your ember in the middle and blow! You don't even need ember extenders (e.g. willowherb etc) .... I've tried this way a few times now and it works well ....it's good to put the smaller shavings and dust in the middle underneath the ember, and pile a few ontop. This basically means you can create a tinder nest anytime (as long as you have wood!), even when it's wet.