By Music1radio
Derbyshire,
United Kingdom 
I have two grapevines growing from pots in my conservatory, they are now 3 years old, first year i cut them back 50% and last year 30% they are growing happily, lots of shoots but no flowers or grapes at any time over the 3years, have i missed something?
2 Jul, 2011
Answers
True, and European grapes need a minimum of 6 hours of direct sun a day, and American and American Hybrids need at least 4 hours of direct sun a day to produce fruit.
2 Jul, 2011
In addition vines do take several years before they start flowering and fruiting.
2 Jul, 2011
Previous question
Hi Music, welcome to GoY . Perhaps you could plant your poor old grape vines in the ground. You will need vast pots as the vines mature. Many conservatory and greenhouse vines have the root outside in the earth. Our 20 odd year old vine is mostly sheltered under a canopy but the root is in the garden. Vines get very vigorous as they age. Ours wants to go 40 feet.....not allowed. It is always cut right back to the 'trunk' in late November and was shortened 2 years ago by about 15 feet. Bonzai vines are unlikely to produce grapes of any size or quality.
2 Jul, 2011