However, you could use some general collective nouns for trees, like:
* Grove - a small group of trees, especially of a particular kind.
* Orchard - a piece of land planted with fruit trees.
* Stand - a group of trees growing together.
* Thicket - a dense group of trees or shrubs.
You could also use a more descriptive phrase like:
* A plantation of orange trees
* A field of orange trees
Ultimately, the best collective noun depends on the context and the specific image you want to evoke.