Species / Cultivar Description
Primo arborvitae (Thuja occidentalis ‘Primo’) is a compact, dwarf arborvitae developed by Iseli Nursery, selected for dense, controlled growth and strong cold hardiness. It naturally holds a tight, mounded structure with short extension, making it a good fit for growers who want a Thuja that stays compact without constant chasing. The foliage is fine and dense, and the growth habit tends to build mass steadily rather than producing long, coarse runners. Its restrained vigor and predictable structure make it a distinctive option among arborvitae cultivars for long-term development.
 
Care Notes
Light: Full sun to part sun
Water: Moderate; prefers evenly moist soil, avoid prolonged drying
Fertilizer: Moderate
Bonsai Development: Responds well to pruning; young growth can be directed, but older wood stiffens and becomes difficult to reposition
In-ground hardiness: Zone 3–7
Winter Care: Cold-hardy and requires winter dormancy; keep outdoors year-round. In colder climates, place on the ground, mulch around the container, and protect from wind