The best replacement for trees is shrubs.

The best alternatives to trees are rated as following:
★★★★★  shrubs
★★★  plants
★★★  christmas trees
★★★  decision tables
★★★  oak
★★  pico
★★  tree's
★★  real christmas trees
★★  artificial trees
★★  bushes
★★  graphs
★  in the ground
★  real trees
★  grass
★  artificial
★  evergreen trees
★  hemp
★  oak trees
★  redwood trees
★  shrubs that grow in shade
★  coniferous trees
★  white oak trees
★  real
★  trends
★  coconut trees
★  hash tables
  solar panels
  artificial christmas trees
  hemp for paper
  cedar trees
  deciduous trees
  birch trees
  lilac bushes
  palm trees
  evergreens
  red oak trees
  cladograms
  white pine
  vines
  palmetto

Your alternative for trees is not listed? Suggest!
Speaking about trees, one probably shouldn't forget about leafs.

Other search terms related to trees and their ratings are:
★★★★★ leafs
★★★★★ red bark
You have in mind a companion for trees and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of trees in all years. Click on graph for more.
trees
shrubs
plants