Himalayan Balsam

a type of  Impatiens or busy lizzie and very busy it is growing up to 2-3m with 800 seeds per plant exploding when ripe here invading the lochside squeezing out other wildflowers not recommended for the garden
extra is Giant Knotweed growing to 4m further down the lochside  same origins  as Japanese Knotweed the shoots of which can appear through concrete!  call the demolition squad for your house if thats established in your garden