Victorinox make a good twin blade gardening knife, The Grafter, might be worth a look... I bought my dad a Victorinox Hunter a few years back as he's always out in the garden, he never uses it and it usually sits in my pocket when I'm out in Spain...
I'm after a knife for using in the garden.
Something that can cut brambles, pruning a little, nothing to heavy duty.
Opinel?