Answer: I've never heard of placing the seeds in the freezer prior to planting, so I'm not sure whether or not that was good advice. There are two types of sweetpeas; annual and perennial. Both kinds can be sown outdoors in late winter in your area, when the soil is still cool. Annual kinds can be sown two weeks before the last (predicted) frost. Perennial kinds can be sown outdoors in autumn, or in late winter. Both kinds of seeds will need to be chipped or soaked for 24 hours prior to sowing. Either of these treatments permits water to penetrate the outer seedcoat and begin the germination process.
I think I'd start with a new batch of seeds and chip the seedcoats or soak the seeds overnight. Plant 1/2" deep and water often enough to keep the soil moist but not soggy wet. Seeds germinate best in temperatures of 55F-65F. Seedlings should appear in 10-20 days for annuals and 20-30 days for perennials.
Hope your second try is successful!
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