You have quite the green thumb there. I germinated grapes from store bought grapes. I planted them down by the garden. They have been growing there unattended to for 20 years. They do flower, but frost hits before they are much bigger than a pea. They are the sweet red grapes. They are more or less weeds. We do have native wild grapes out along the river, but they are sour as all get out and no one bothers with them much unless they are making jelly I suppose.