Grape vines do need regular feeding with a balanced feed such as[believe it or not] fish and bone every six weeks or a liquid feed such as seaweed fertiliser every few weeks.

Thanks for the info will get some this weekend.

If these are table grapes then you are better off using a liquid tomato feed every two weeks. All grape vines can be fed February using Growmore or other general fertiliser at 70g per sq. metre, plus sulphate of potash at 15g per sq m to 30cm either side of the base of the vine. That said if you've actually seen vines for making wine growing in France & Germany they are never ever fed!

agreed with you moon, some grapes dont need feed but france and germany have a better climate for growing grapes, so it's no surprise