What hardiness zones is Pseudopanax suitable for?

Pseudopanax spp. is the lancewood genus, approximately 12–20 species of evergreen trees endemic to New Zealand, growing 15–50 feet (4.5–15 m) tall and 6–15 feet (1.8–4.5 m) wide. The genus is defined by heteroblastic development: a single individual passes through distinct juvenile and adult leaf forms over 10–20 years. The juvenile form is a single-stemmed unbranched pole with long narrow sword-like downward-pointing leaves 12–36 inches (30–90 cm) long, dark brown to dark green. After 10–20 years the tree transitions to the adult form, which has a branching crown and shorter broader leaves 3–6 inches (7–15 cm). The two leaf forms are so different that early botanists described them as separate species. P. crassifolius (lancewood) shows the most pronounced juvenile-to-adult transition and is the species seen in cultivation more often than others in the genus. The genus sits in the ginseng family (Araliaceae spp.). The heteroblastic transition is hypothesized as an anti-browsing adaptation against the extinct moa (Dinornithiformes spp.); the downward-pointing sword leaves of juvenile plants may have deterred the flightless bird from browsing. Dioecious — male and female flowers occur on separate plants — with small black drupes on female plants. Frost tolerance is low: foliage is damaged below 20°F (−7°C). Non-toxic. Deer-resistant. Full sun to partial shade. Hardy in USDA zones 8–10. This entry represents the genus; individual species differ in leaf shape, color, and growth rate.

Native Range

Endemic to New Zealand, in lowland to montane forests. The genus contains approximately 12–20 species.

Suggested Uses

Commonly planted as a specimen in USDA zones 8–10 where the heteroblastic leaf transition can be observed over 10–20 years from a single plant. The juvenile sword-like form functions as a narrow vertical accent in borders, courtyards, and architectural plantings during the first decades. Container culture in 10-gallon (38 L) or larger pots suits the juvenile stage, with the pot providing overwintering mobility in zones 7 and colder. The genus is a New Zealand endemic, non-toxic, and deer-resistant. This entry represents the genus; individual species should be selected for specific height, leaf color, and growth rate.

How to Identify

Identified by the heteroblastic leaf transition on a single individual: the juvenile form is an unbranched single-stemmed pole with long narrow sword-like downward-pointing leaves 12–36 inches (30–90 cm) long; the adult form, reached after 10–20 years, has a branching crown with shorter broader leaves 3–6 inches (7–15 cm). The two life stages are visually so different that early collectors assigned them to different species. P. crassifolius is the species seen in cultivation more often than others in the genus. The genus sits in Araliaceae spp. (the ginseng family) rather than in any conifer or Podocarpaceae spp. family, despite the juvenile pole habit.

Appearance

Size & Dimensions

Height15' - 50'

Width/Spread6' - 15'

Reaches mature size in approximately 30 years

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Produces greenish, small, inconspicuous flowers in compound umbels. Small black drupes 0.25 inch (6 mm) follow on female plants. The genus is dioecious. The heteroblastic foliage development across the life of the tree is the year-round visual feature.

Detailed Descriptions

Flower Description

Greenish, small, inconspicuous, in compound umbels; dioecious; black drupes 0.25 inch (6 mm) follow on female plants

Foliage Description

Dark brown to dark green; juvenile form carries long narrow sword-like 12–36 inch (30–90 cm) stiff downward-pointing leaves on an unbranched stem; adult form carries shorter broader 3–6 inch (7–15 cm) leaves on branching stems; the two leaf forms appear on the same individual at different life stages

Growing Conditions

Sun Requirements

Full Sun Partial Shade

Requires 4-10 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range5.5 - 7.0(Neutral)

357912

Soil Types

loam sand silt

Drainagewell drained

Water & Climate

Water Needs

Medium

Frost Tolerance

hardy

Time to Maturity

10-20 years

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Plant in full sun to partial shade in well-drained loam, sandy, or silty soil at pH 5.5–7.0. Hardy in USDA zones 8–10. Frost tolerance is low; foliage is damaged below 20°F (−7°C), so unheated greenhouse or conservatory overwintering is used in colder zones. The juvenile-to-adult heteroblastic transition takes 10–20 years on most species; the juvenile pole stage is the garden-interest phase for several decades before the canopy broadens. Dioecious: fruit set requires a female plant and a nearby male pollen source. Drought tolerance is moderate once established. Deer do not browse the stiff juvenile foliage.

Pruning

Pruning is not used. The heteroblastic transition from juvenile unbranched pole to adult branching crown unfolds on its own timeline over decades. Topping the juvenile pole or heading cuts into the main stem disrupts the natural transition and are avoided. Remove dead or damaged branches only.