Swan River Pea
Gastrolobium celsianum (formerly known as Brachysema lanceolatum), commonly called the Swan River Pea, is a beautiful, hardy native shrub originating from southwestern Australia.
This spreading evergreen is a favorite in native landscapes for its bright red pea-shaped flowers, low-maintenance needs, and ability to thrive in a variety of conditions.
It typically grows to around 1–1.5 metres high, spreading 2–3 metres wide, making it suitable as both a ground cover and a low informal hedge.
How To grow Gastrolobium celsianum
This is a very easy care plant once established.
- Choose the Right Spot: A position in full sun to part shade works best. Avoid deep shade
- Prepare the Soil: Ensure the area is well-drained and free of weeds before planting.
- Planting: Dig a hole twice the width of the root ball, place the plant, and backfill. Water in well.
- Mulch: Apply mulch to retain soil moisture and suppress weeds, but keep it away from the base.
- Watering: Water regularly through the first summer, especially during dry spells.
- Feeding: Apply a low-phosphorus fertiliser designed for Australian natives in spring.
- Pruning: Minimal pruning is needed—avoid cutting back into old wood.
Landscaping Uses
Swan River Pea is a versatile landscaping plant, suitable for
- Native garden beds as a feature or filler shrub
- Low informal hedges or background planting
- Erosion control on embankments and slopes
- Ground cover in open areas and under light canopy
- Rock gardens, especially when used with gravel or native stone
- Commercial plantings, due to its low maintenance and ornamental appeal
This species is variable in form—some plants may be bushy while others are more prostrate. The low-growing form is often sold as Gastrolobium latifolium, noted for its broader leaves.
Key Features of the Swan River Pea
- Botanical Name – Gastrolobium celsianum (syn. Brachysema lanceolatum)
- Common Name – Swan River Pea
- Origins – South Western Australia
- Climate – A Mediterranean type climate suites well or Warm to Cool temperate zones.
- Position – Full sun to a little shade
- Soil – Well drained wiyth a neutral pH
- Height – To 2 metre, often smaller.
- Spread – To 2 – 3 metres.
- Flowers – Red flowers from winter to spring
- Foliage – Dense evergeen Olive Green foliage with silvery reverse.
- Uses – Attracts native birds, especially nectar seeking birds. Erosion Control.
- Frost tolerant – Light to moderate frosts.
- Coastal Gardens – Suited to sandy coastal soils.
- Best grown away from strong competition with other plants
Toxicity
While many Gastrolobium species are known to be toxic to livestock and pets, Gastrolobium celsianum is believed to be non-toxic. However, always consult your veterinarian before introducing any new plant to gardens where animals may browse.
Why Choose Swan River Pea for Your Garden?
- Easy to grow and low maintenance
- Drought tolerant once established
- Adds vibrant seasonal colour
- Attracts native birds and pollinators
- Helps control soil erosion on slopes
Whether you’re designing a native garden, adding colour to a rockery, or stabilising a coastal bank, Gastrolobium celsianum offers visual appeal, ecological benefits, and reliable hardiness.
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