Ruling 2256
If a person forms an agreement with someone to, for example, hand over some fruit trees – the fruits of which either belong to him or are at his disposal – for a specific period so that he may tend to and water them, and in return take an agreed portion of the fruits for himself, then such a transaction (muʿāmalah) is called a ‘tree tending contract’.
-Ayatullah Sistani, Practical Laws of Islam, Tree Tending Contract (Musaqah) and Tree Planting Contract (Mugharasah)