Howdy my green fingered wizards. I have a gravelled garden with slightly raised beds that go into the soil under the gravel membrane. There is a small cluster of knotweed coming under the fence at the very back of the garden ~5metres from the frontline of the closest bed. We live in an area of heavy clay soil. My questions are: Will it eventually creep and overtake my beds or just stay quietly in its corner if i just cut back growth? (No weedkiller or smother tactics) And Is it okay to grow veg and edible food this close? Bearing in mind the suspect area may have been saturated with an unknown ammount of shop-bought weedkiller (not a drop of weedkiller used since ive been in property which is 1yr 6m) Apologies if they are naive questions. Thanks.