[Kristen]

Avoid disturbing the roots on the peas, they don't like it,

You sure on that point? I ask because growing them in guttering is common, which has to be fairly high on the root-disturbance-scale when planting out?

[Yorkie]

The guttering approach shouldn't disturb the roots when planting out - you just dig a trench the size / shape of the guttering, and slide the peas / compost out wholesale.  Root disturbance occurs more frequently when you have to separate plants and thus break intertwined roots, or with root crops which just don't like it at all.