I think collecting enough nectar to make wine would be a very long and difficult job. On the other hand you could let the bees collect nectar for you and turn it into honey, then turn the honey into wine -- more properly called mead.
the parts of a flower that make nectar
Bees want the nectar to make honey. The bees move pollen from flower to flower while they gather the nectar.
red flower with honey
The flower's sweet nectar attracts bees to pollinate it. Bees gather nectar and make it into honey.
You need an article before the singular noun "flower" (a flower, the flower). Or make it "flowers" (plural).
The thing that attracts an insect to a flower is the nectar inside the flower.
They take the nectar from flowers to make honey.
Kudzu
No. But many flowers contain nectar.
Because they don't need animals to polinate. If they make nectar or have bright colours and strong scents, it will be an animal-polinated flower. So they don't need to make nectar or have bright colour
in the ovary
In some plants, the flower will keep producing nectar for up to several days before it dies and the seeds begin to form. In others, the flower produces just one batch of nectar. In some plants such as lantana, flowers may stay on the plant long after they have been pollinated and stop producing nectar in order to add to the attractiveness of the plant to pollinators.