Answer: Grapes require certain amounts of accumulated heat units in order to ripen. Different cultivars have different requirements so not all kinds of grapes can be grown in all areas. Most of the grapes sold in stores have traveled a long way to reach their destinations, and most have higher heat unit requirements than you can provide in your Portland area garden. There are two grape cultivars that will grow in your Pacific Northwest garden and produce fruit similar to your descriptions: 'Glenora' is a blue-black seedless grape that's sweet and spicy. 'New York Muscat' is an oval reddish-blue, almost seedless, sweet grape. These plants are available from Raintree Nursery, 391 Butts Rd., Morton, WA 98356, phone (360) 496-6400, or from Northwoods Nursery, 27635 S. Oglesby Rd., Canby OR 97013, phone (503) 266-5432.
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