Hardy Kiwi

Hardy kiwi 'Issai' is a Japanese, lower-vigor cultivar of Actinidia arguta grown for smooth, green, grape-sized fruit. It can fruit without a separate male vine, though added pollen may improve fruit size. ## Landscape Use Train this woody climber across an arbor, pergola, or sturdy trellis with room for its canes and access for harvest. Oregon State University Extension describes 'Issai' as self-fertile; its Pacific Northwest trials report moderate vigor and an early-September harvest. The guide also reports greater Phytophthora root rot sensitivity in trials, so avoid standing water and use deep, well-drained soil. The [OSU guide](https://extension.oregonstate.edu/catalog/pnw-507-growing-kiwifruit-guide-kiwiberries-fuzzy-kiwifruit-pacific-northwest-producers) provides cultivar-specific fruit and vigor information; [Wisconsin Horticulture](https://hort.extension.wisc.edu/articles/kiwifruit-actinidia-spp/) describes species-level flowering and pollination. ## Seasonal Interest UW-Madison Extension says hardy kiwi flowers are white to cream and open in late spring. Smooth green fruit ripens in early autumn in Oregon trials; local bloom and harvest dates vary. ## Maintenance Establish permanent support before the vine grows large. Train and prune canes regularly to keep the canopy manageable and maintain fruiting wood. Keep soil well drained and protect tender spring growth from late frost.