Thank you for reaching out.

The recommendation you got about grapes and kiwi is correct.

You can plan the hardy kiwi (Kiwiberry). This hardy kiwis is smooth, hairless, grape-sized fruits that you can eat right off the vine. They are highly disease resistant, grow in full sun and are hardy for Minnesota winter.

About kiwiberry https://fruit.umn.edu/kiwiberries-mn-fruit-crop

This hardy kiwi is dioecious, so you need both a male and a female plant for pollinator to get fruit. Since you have 2 trellis, you can plant one plant per trellis. The varieties I would suggest are ‘Arctic Beauty’, which is a male plant, and a ‘Anna’ or ‘Ananasnaya' which are female. You need to keep the two trellises near each other so pollinators can easily move between them. The male plant will have variegated white and pink leaves, while the female plant will provide fruit harvest.

I would say the best time to plant is spring, after the threat of frost has passed. Planting in spring allows the plants to have a full season to grow before winter comes.

While for maintenance, hardy kiwis are pretty low maintenance, the chance for pests and disease is pretty low. They do require some work like regular pruning in winter and consistent watering as they are vigorous growers. Also anchor the trellis securely as the vines can get heavy, particularly the female one with fruits.

If you prefer grapes, native Minnesota table grapes that can survive winter is also an option. E.g. ‘Blue Bell’ or ‘Swenson Red’ are good choices. You still should plant one plant per trellis but grapes are self fertile so both will get fruits. However, more disease management is required for grapes compared to hardy kiwis, like mildew or black rot.

Hope this helps.