Alcantarea imperialis 'Red Plum' is a striking bromeliad native to Brazil, renowned for its large, silver-grey leaves with purple undersides. In Australia, it thrives in subtropical and tropical climates, particularly in areas with mild winters and warm summers. Here are some growing tips for cultivating Alcantarea imperialis 'Red Plum' in Australia:

1. **Climate and Location**: Plant 'Red Plum' in a location that receives bright, indirect sunlight. It can tolerate full sun but may appreciate some shade during the hottest part of the day, especially in regions with intense sun exposure.

2. **Soil**: Use a well-draining potting mix or plant directly in the ground with good drainage. Bromeliads like 'Silver Plum' prefer slightly acidic to neutral soil.

3. **Watering**: Keep the central cup (or tank) filled with water to provide moisture to the plant. Water the soil sparingly, allowing it to partially dry out between waterings. Avoid overwatering, as this can lead to root rot.

4. **Fertilization**: Feed the plant with a balanced, water-soluble fertilizer diluted to half-strength once a month during the growing season (spring and summer). Reduce fertilization during the cooler months.

5. **Temperature and Humidity**: Alcantarea imperialis 'Red Plum' prefers temperatures between 18-30°C (64-86°F) and high humidity levels. In regions with low humidity, consider misting the plant occasionally to increase moisture levels.

6. **Propagation**: Propagate 'Red Plum' by collecting offsets (pups) that develop around the base of the mature plant. Wait until the pups are approximately one-third the size of the parent plant before detaching them. Plant the pups in a well-draining soil mix and keep them lightly moist until they establish roots.

7. **Maintenance**: Remove any dead or damaged leaves regularly to maintain the plant's appearance and prevent pest infestations. Trim off spent flowers to encourage new growth.

8. **Protection from Frost**: In cooler regions or during occasional frosts, provide protection to 'Red Plum' by covering it with a frost cloth or moving potted specimens indoors.

By following these growing tips, you can enjoy the elegant beauty of Alcantarea imperialis 'Red Plum' in your Australian garden or indoor space.