A scene calls for unique trees and other plants in the background, What is the optimal tool or technique to create complex plants that will save production time and still look good in a final rendering?

Autodesk Maya, commonly shortened to just Maya, is a 3D computer graphics application that runs on Windows, macOS and Linux, originally developed by Alias and currently owned and developed by Autodesk. It is used to create assets for interactive 3D applications, animated films, TV series, and visual effects.
Blender and Maya are two of the most popular 3D software applications on the market today.