What is the extent of the prohibition of orlah? Is it just eating that is prohibited (issur achila), as is written (Vayikira 19:23), or is benefiting from orlah also prohibited (issur hana'ah)?
Orlah (fruit from trees planted within 3 years) is forbidden for all benefit, see e.g., Mishne Torah Maachalot Assurot 10:9
Whenever anyone plants a fruit tree, it is forbidden to partake of or benefit from all of the fruit the tree produces for three years after being planted
For details see e.g., here from aish. Note this applies both in and outside Israel.