A nasty weed that spreads by exploding seedpods is discovered in Gordon’s garden. Gordon tries to de-fuse the seedling, but the Chief Gnome surprises him at a crucial moment and it goes off. As the Chief Gnome busies himself establishing a crisis centre, Percy reveals that he has accidentally fed the same plant some Speedy Massive Grow fertiliser and they’re just about to explode! Can Gordon get rid of the weed successfully from his garden?