Privet is the cheaper practice tree; Chinese elm is the better tree to keep. That's the whole comparison in one line, and the rest of this page is the receipts.
Both are fast, both forgive hard pruning, and both cost less than a bag of bonsai soil to get started. Ligustrum sinense often costs nothing: a thick section of someone's old hedge, chopped and potted, is respectable material. Ulmus parvifolia shows up at the big-box store as the $20-40 S-curve starter, or at a nursery as a $15-30 1-gallon plant.
The split comes down to where the tree lives and what it looks like in five years. Privet is an outdoor tree with spring flowers and a rounded broom canopy. Chinese elm can spend the winter on a windowsill and grows bark that flakes into orange, gray, and tan patches. Pick on that, not on price.
| Attribute | Chinese Elm | Privet |
|---|---|---|
| Difficulty | Beginner | Beginner |
| Environment | Indoor or outdoor | Outdoor |
| Light | Full sun to partial shade | 5-6 hours direct sun |
| Water | Moist, top quarter-inch | Moderate, top half-inch |
| Growth Rate | Fast | Fast |
| Mature Size | 10-20 inches | 8-20 inches |
| Best Styles | Broom, informal upright, root-over-rock | Broom, informal upright, twin-trunk |
| Price Range | $15-40 starter | Free to $25 starter |
Where the tree lives is the first cut. Chinese elm handles a bright south or west window year-round, and outdoors it stays semi-evergreen in warm zones and drops its leaves in cold ones. Privet is an outdoor tree: full sun to partial shade, with 5-6 hours of direct sun for the densest growth. In zones 6-7 it goes bare for winter, which is normal and not a dead tree.
Sourcing is where privet wins outright. Hedge trimmings, garden center clearance racks, and landscaping jobs all yield free to $10 material, and nursery stock runs $10-25 for a 1-3 gallon pot. Chinese elm nursery stock is $15-30, the S-curve mallsai is $20-40, and pre-bonsai from Wigert's runs $50-150. Check that the elm's label reads Ulmus parvifolia and not U. pumila, the Siberian elm, which makes a worse bonsai.
Pruning workload is the hidden cost of privet. It grows constantly, and a few unattended weeks in July turn a refined tree into a shrub; you let shoots reach four to six leaf pairs, cut back to one or two, and repeat all summer. Chinese elm follows a similar rhythm at 6-8 leaves cut to 2, but it can be pruned any month of the year and holds a silhouette longer between sessions.
Wiring favors the elm. Chinese elm branches bend cooperatively, set in 3-6 months, and only ask that you pull the wire at the first sign of bark pressure. Privet outgrows wire before it sets; branches thicken enough to scar within a season, so keep wire for green shoots only and build the design with directional cuts.
What each becomes in three years differs. Privet builds a rounded broom canopy over a straight or gently curved trunk, throws white flower clusters in spring followed by dark berries, and reads as a credible bonsai after two to three seasons of steady clipping. Chinese elm builds the same broom, but the payoff is the trunk, which develops mottled, flaking bark you will want to keep visible in the design.
Watering, cold, and pets are the last three checks. Privet takes the top half-inch drying and tolerates slightly wet soil; elm wants the top quarter-inch checked daily and wilts dramatically when missed, then recovers within hours of a soak. In a pot, protect both below about 25°F; in the ground privet is hardy to -10°F and elm to -20°F. Privet is toxic to cats and dogs; Chinese elm is safe.
Pick the privet if you grow outdoors, want to practice defoliation, hard chops, and jin on a tree you can replace for free, and don't mind clipping every week or two in summer. It's the workhorse for a reason.
Pick the Chinese elm if the tree might live indoors part of the year, if you want to learn wiring, or if you want bark worth showing off. Pay the extra $20.
Neither is the buy if you have no outdoor space and only a dim window: privet won't cope inside at all, and an elm in a north window slowly declines.
