Crushed hemp seed is a top ingredient for making groundbaits more active. This additive sends off an attractive oily slick, helping to burst groundbait out of open-end feeders in an enticing cloud of particles. Tinned hemp is another great fish attractor when mixed with groundbait. This gear is pressure cooked, so it holds in all its flavour and oils, which helps to turn groundbait extremely active, sending an impressive fizz of bubbles to the surface.