Parahebe catarractae

speedwell hebe

Plantaginaceae

New Zealand (North and South Islands; rocky streamsides, cliff faces, damp rocky ground)

Attracts Pollinators Attracts Butterflies Deer Resistant Drought Tolerant Container Friendly

SunFull Sun – Part Shade

WaterMedium · drought-tolerant

HardinessZones 7–9

Overview

Parahebe catarractae (now reclassified as Veronica catarractae under recent phylogenetic revisions) is a low semi-evergreen sprawling subshrub reaching 6–12 inches (15–30 cm) tall with a spread of 12–24 inches (30–60 cm) and a mounding-to-trailing habit. Native to New Zealand, where the species grows on rocky streamsides and cliff faces, this subshrub opens loose racemes of small saucer-shaped flowers across a long bloom window from June through October. Each flower runs 0.3–0.5 inches (8–13 mm) across, white to pale lavender with reddish-purple veining and a darker central eye, giving the planting a narrow-textured floral appearance at close range. Opposite ovate-to-lanceolate leaves run 0.5–1 inch (1.3–2.5 cm) long, dark green in color, with serrate margins, and often tint bronze-purple in cold weather. Growth rate runs moderate. Hardy to zone 7. Tree lifespan runs short at 3–5 years, but the species self-seeds in favorable garden conditions and maintains colony presence through seedling recruitment.

Native Range

Parahebe catarractae is native to New Zealand across both North and South Islands, growing on rocky streamsides, cliff faces, and damp rocky ground. The species has recently been reclassified under phylogenetic revisions to Veronica catarractae, though the older Parahebe spp. name remains in common horticultural use. The cliff-face native ecology translates in garden cultivation to a requirement for sharp drainage combined with tolerance of periodic drought once the root system establishes.

Suggested Uses

Planted in rock gardens, raised beds, wall tops, or border fronts at 12–18 inch (30–45 cm) spacing in zone-7-and-warmer gardens. The long bloom window from June through October runs rare among small subshrubs of the species' compact scale and supplies the species' primary ornamental feature. Sharp drainage is required through winter because wet soil conditions cause crown rot and shorten lifespan. Short 3-to-5-year lifespan is offset by self-seeding that maintains the planting's presence across successive plant generations. Wet winter soils and cold climates below zone 7 are poor fits for the species.

How to Identify

Separated from Hebe spp. species by the much lower sprawling habit (6–12 inches versus 1–6 feet for typical Hebe spp. species) and by the looser flower raceme structure. Separated from herbaceous Veronica spp. species by the woody-based subshrub habit versus the purely herbaceous habit of herbaceous Veronica spp. species. Separated from Parahebe perfoliata by the non-clasping leaves (versus the clasping leaves of P. perfoliata) and by the white flowers with purple veining (versus the blue-purple flowers of P. perfoliata). A low sprawling subshrub with white purple-veined saucer-shaped flowers opening across a long summer-into-autumn window identifies the species.

Appearance

Size & Dimensions

Height6" - 1'

Width/Spread1' - 2'

Reaches mature size in approximately 2 years

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~14 weeks

Summer Fall

Loose racemes of saucer-shaped flowers 0.3–0.5 inches (8–13 mm) across open in white to pale lavender coloration with reddish-purple veining and a darker central eye from June through October. The species runs among the longer-blooming small subshrubs in temperate cultivation, with a fresh bloom window of 12–16 weeks that covers the entire summer season and extends into mid-autumn. Regular deadheading of spent flower racemes extends the bloom window.

Detailed Descriptions

Flower Description

White to pale lavender with reddish-purple veining and a darker eye; saucer-shaped 0.3-0.5 inch; June-October

Foliage Description

Dark green; ovate to lanceolate 0.5-1 inch; serrate margins; opposite arrangement; bronze-purple tint in cold weather

Growing Conditions

Sun Requirements

SunFull Sun SunPartial 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

Drainagewell drained

Water & Climate

Water Needs

Medium

Frost Tolerance

hardy

Time to Maturity

1 year

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Full sun to partial shade in moist well-drained soil (pH 5.5–7.0) matches the species' cultivation needs. Hardy to zone 7 (0°F / −18°C). Good soil drainage is essential because wet winter conditions cause crown rot and shorten the species' already-limited garden lifespan. Tree lifespan runs short at 3–5 years, but the species self-seeds in favorable garden positions and maintains colony presence through seedling recruitment. Light cutback in spring maintains the compact mounding habit and encourages fresh growth from the woody base.

Pruning

The species is cut back by roughly one-third in early spring to maintain compact form and stimulate fresh growth from the woody base. Winter-damaged growth is removed at the same time. The woody base becomes leggy after 3–4 years of growth, and replacement planting from self-sown seedlings or fresh container-grown plants may be needed on roughly a 4-year cycle to maintain the planting's appearance.

Pruning Schedule

early spring