Grapes are a full sun deciduous plant that needs a dormant period that is not related to a required chilling temperature. Plenty of light for house plants is not enough light for a full sun plant. A device is being sold by leevalley.com that will tell you how much light you have over a full day. It costs about $30 and allows you move it around the garden to check light in different locations. Al

thanks for the info, I do have a spot or two in y outdoor garden that I am curious about.

My living has solar tube and a 11x7 bay window that gets southeast light. I grow orchids and cactus in that room with no issue. Been watching the window light past couple days and think I will be o.k. but this giszmo will tell em for sure.

now let's say that it is fine as for dormancy, would just putting the plant in a cool closet and water a little once a month be sufficient? and for how long?

andrea:

If you are in zone 5, you could satisfy the dormancy by putting the plant outside or in an unheated garage for a couple of months. I would think the best time outside would fall. Set it out several weeks before your ave first frost. Leave it until the leaves have fallen. Then back inside before a really hard freeze. I won't put it outside in mid winter because that would be too cold esp if it hasn't hardened off. In an unheated garage the best time might be mid winter. You just want enough cold to knock the leaves off.

This should get the needed rest period. I think your plant will grow inside just don't expect much fruit. Regardless of how bright it is in your room, it is not likely to be enough light for much of a crop. But you don't have much to lose so why not try.

The Fruitnut