I know it's often recommended to snip the roots of leeks before you plant them and I'm not sure why.
When I was pricking out some coriander today (I know it's said it doesn't transplant well, but that's another matter!) I was amazed how long the roots were and wondered if I could snip them before putting into pots/ground, rather than have to dig really deep or have the roots curling round? Despite only having one true leaf some of the roots were about a foot long!