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Guttering is fine for first early peas or a short row.. but when you have 40' of row it's easier to plant direct with the Jeyes, olbas, paraffin etc...
I might be able to give you a better answer in a week or so.I have found that fresh seed can be sown successfully straight in with a good germination percentage.However a few weeks back I sowed some last year left over seed and got a poor germination rate.So I chitted some seed and it seemed that about 95% sprouted so I am now waiting to see if the sprouted seed produces more actual plants.
A good remedy for mice is to dip the seeds in paraffin before planting. The mice wont smell them and it does no harm to the seeds..