Southern amaranth (Amaranthus australis)
Care, watering, light and tips for Southern amaranth on Floravia.
Quick facts
- Family: Amaranthaceae
- Difficulty: Easy to care for
- Watering: every 3 days
- Light: Partial shade
- Temperature: 10–30 °C
- Toxicity: Toxic to pets
About Southern amaranth
Amaranthus australis, commonly known as Southern Amaranth, is a robust annual herb, often growing quite large, reaching several meters in height. It is characterized by its large, lance-shaped leaves and dense, branched inflorescences that range from green to reddish. It is ideal for spacious gardens, where it can serve as a striking background plant or create an ephemeral tropical effect.
Native range
Southeastern United States and the Caribbean
Care tips
This species thrives in full sun and well-drained soils rich in organic matter. Watering should be regular, especially during dry periods, to keep the soil consistently moist but not waterlogged. It is a fast-growing plant that can become invasive under optimal conditions, so controlling its spread is recommended. A common mistake is underestimating its ultimate size, leading to planting it in overly confined spaces.
How to save a dying Southern amaranth
- Warning signs
- Wilting or yellowing leaves, soft or drooping stems. Could be due to under or overwatering.
- First aid
- Check soil moisture. If dry, water thoroughly; if waterlogged, remove excess and improve drainage.
- What kills it
- Constant waterlogging, causing root rot, or prolonged drought that exhausts the plant.
- Can it be saved?
- Yes, if roots aren't completely rotted and stem still has firm areas.