Peas don't need a lot of heat to germinate. If you sow in an unheated greenhouse that is adequate. I put 5 seeds in a 4 inch square pot, one in the centre and one in each corner. As they get to a few inches high and the roots fill the pot, harden off and plant the whole pot outside. A dozen potfuls is more than adequate in one go. Sow again after about four weeks to give a succession.
I've always had the best luck direct-sowing peas. They're a cool weather crop, so I usually plant out in mid-April, just as the ground becomes workable. We can get hard frosts up to the beginning of June, and it never bothers the peas.
New England, USA
Metacomet soil with hints of Woodbridge and Pillsbury
I agree, it can be good to give them a head start., but don't leave them in pots too long. Sowing in open ground is fine but , Mice, squirrels, and pigeons all love them so they need some protection.
Same here @CrankyYankee, direct sowing peas and beans always works best for me. Coincidentally I’ve just this morning sowed Oregon Sugar Snap in the ground, along with Aquadulce broad beans and Charlotte seeds potatoes. I’ve never had a problem with mice, squirrels or pigeons but the whole bed is netted to both stop our cats using it as a toilet and to provide protection from an over-curious puppy!
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
Peas and beans used to be rolled in red lead oxide and paraffin to deter animals eating the seeds. Red lead is poisonous and no longer available for garden use , although it is still used in some antifouling paint for boats I believe.
I've never used it. My beans and peas have plenty of the nodules that contain the rhizobium bacteria . They can survive for years in the soil, waiting for the suitable host legumes. Any normal rotation system will have soil that does not need extra innoculation.
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I more or less follow @fidgetbones regime except I do separate once germinated and growing before planting out.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.