When talking about the unseen matters, the human intellect cannot compare them to any others, Allah (swt) says:
﴾مَّثَلُ الْجَنَّةِ الَّتِي وُعِدَ الْمُتَّقُونَ ۖ ﴿
(Is the description of Paradise, which the righteous are promised,…) (Muhammad: 15)
Here, we can see that the description of Paradise are but a way of giving an approximate picture to the minds. The Prophet (saws) has said when describing the Paradise:
(Allah, the Exalted and Glorious, said: I have prepared for My pious servants which no eye (has ever) seen, no ear has (ever) heard and no human heart has ever perceived.)
That is, we are unable to give names to things which are non-existent in front of our senses.
The Gardens in Paradise, means gardens surrounded by trees.
The grape is every fruit that is full of sugar and water.
Nothing in this life is similar to that in Paradise except the names.
 Sahih Al-Bukhari, Book of the beginning of creation, Hadith No. 3072.