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Cold Hardy Grapes and Vines: Summer Field Notes

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Field note · June 2026

wild grapes, cold stratified from nov through march so about

Oak Summit Nursery · Southern Manitoba

wild grapes, cold stratified from nov through march so about five months in the fridge in some damp vermiculite, planted in april. they're a good size to transplant now, I usually put 2-3 to a cell in our plug trays but singles are also ok. funny story I divided up any earlier batch in june and we actually got frost mid june here in southern MB and it took out most of those outside small tender grape seedlings. So my advice when you grow these is to make sure they have some frost protection the first spring. all grapes seem to see about five months of cold conditioning for the seeds to germinate, so if you're going to grow them from seed start them early in the fall. you can also plant outside into pots, and then generally the seedlings will have more frost tolerance than greenhouse transplants.