Protea Southern Cross

Southern Cross

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Protea Southern Cross
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  • Protea Southern Cross
  • Protea Southern Cross
  • Protea Southern Cross
  • Protea Southern Cross
  • Protea Southern Cross
  • Protea Southern Cross
Southern Cross

Southern Cross

Protea magnifica x obtusifolia

Southern Cross Protea - a remarkable winter flowering hybrid Protea. This extraordinary Protea boasts both drought tolerance and a remarkable degree of frost tolerance once it has firmly established itself. What’s more, it exhibits an impressive ability to thrive in heavier soils, setting it apart from many other Protea varieties. Southern Cross is the successful result of a crossbreeding between Protea magnifica and obtusifolia.
Plant Info

Plant Size: Height 1.8m x Width 1.5m
Flowering: Late Winter – Early Spring
Position: Full Sun
Water Usage: Low
Frost Tolerance: Moderate
Soil Type: Well drained acidic soil, Low pH
Suitable For: Home Garden, Floristry
Growing Instructions

Climate & Position:

Proteas thrive in full sun with good air circulation. Plant in an open, well-drained position that receives at least 6 hours of sunlight daily. Most varieties prefer Mediterranean-style climates with dry summers and cool, wet winters, but many grow well in temperate Australian conditions. Avoid humid, poorly ventilated areas and poorly drained soils.

Soil Requirements:

Excellent drainage is essential. Proteas prefer sandy, gravelly or free-draining soils with a slightly acidic pH (5.0–6.5). Avoid heavy clay soils or areas where water sits after rain. If drainage is poor, improve with raised beds or mounding.

Proteas are sensitive to phosphorus, so avoid rich manures and high-phosphorus fertilisers.

Water Requirements:

Water regularly during establishment, especially through the first summer. Allow the soil to partially dry between watering. Once established, Proteas are relatively drought tolerant and generally only require occasional deep watering during extended dry periods.

Avoid overwatering and waterlogged soil.

Fertilising:

Proteas require minimal fertiliser. Feed sparingly with a low-phosphorus fertiliser formulated for Australian native plants during spring and autumn if required.

Avoid general-purpose fertilisers, manures and heavily enriched composts.

Mulching:

Apply a light layer of coarse mulch such as pine bark or wood chips to help retain moisture and suppress weeds. Keep mulch away from the base of the plant to maintain airflow and reduce the risk of rot.

Avoid disturbing the shallow root system when weeding or cultivating around the plant.
Care & Maintenance

Pruning:

Regular light pruning helps maintain a compact shape and encourages more flowers. Prune after flowering by removing spent flower stems and lightly trimming back new growth.
Avoid cutting back into old, bare wood with no leaves, as Proteas may not reshoot from hard pruning. Young plants benefit from light tip pruning to encourage bushier growth.

General Pruning Guide:

- Prune after flowering has finished
- Remove spent flowers with a section of stem attached
- Retain healthy leafy growth on stems
- Avoid removing more than one-third of the plant at a time
- Remove weak, damaged or inward-growing stems to improve airflow

Regular harvesting of flowers also acts as a natural form of pruning.

Frost & Climate:

Most Proteas prefer sunny positions with good airflow and perform best in dry summers and mild winters. Many varieties tolerate light to moderate frost once established, though young plants may require protection from heavy frost.
Proteas generally dislike prolonged humidity and poorly ventilated conditions, which can increase the risk of fungal disease.

Growing Proteas in Pots:

Many Proteas grow very successfully in pots when provided with excellent drainage. Use a premium low-phosphorus native potting mix and select a pot with multiple drainage holes.
Place pots in full sun and water deeply when the potting mix begins to dry out. Avoid allowing pots to sit in water. Proteas in containers may require more regular watering than plants grown in the ground.

Cut Flower Harvesting:

Proteas make excellent long-lasting cut flowers. Harvest blooms when flowers are well coloured and beginning to fully open. Cut long stems with healthy foliage remaining below the cut to encourage future flowering.
For best vase life, recut stems regularly and change the water frequently. Protea flowers can also be dried by hanging stems upside down in a cool, dry position with good airflow.
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