Nominal affix signifying the land on which something is planted.
The two words ‘coconut grove’ and ‘banana grove’ occur also with ka- -an. But ‘coffee grove’ does not. The -an seems to focus on the piece of land planted with trees while the word with ka- -an focuses on the collection of trees.
His coconut grove is extensive.
Whose banana plantation is that?
His coffee grove is bearing fruit now.