In this Surah Allah mentions various herbs and foods. His mentioning of these herbs/foods occurs when He explains the good things He has provided for mankind (in general) and for the Believers (specifically) in the next life.
وَأَنزَلْنَا مِنَ ٱلْمُعْصِرَٰتِ مَآءًۭ ثَجَّاجًۭا
لِّنُخْرِجَ بِهِۦ حَبًّۭا وَنَبَاتًۭا
"And have sent down from the rainy clouds abundant water. That we may produce therewith corn and vegetations, and gardens of thick growth." (78:14-16)
إِنَّ لِلْمُتَّقِينَ مَفَازًا
"Verily, for the Muttaqun, there will be success (Paradise);. Gardens and grapeyards." (78:31-32)
May Allah bless us with the best in this life and the next. Ameen.