Argentine amaranth: complete guide

Overview

Argentine amaranth is a compact to moderately vigorous annual from Bolivia and southern South America. This plant grows low and creeping but achieves larger spread than Mat amaranth. At 20-40 cm height and 40-60 cm spread, it forms less dense ground cover but more individual form.

Also known as Pendant amaranth, this plant loves warmth. It's a good choice for hot locations where other amaranths struggle. On gardenworld.app, see how this plant works in warm-region garden designs.

Appearance & bloom cycle

Argentine amaranth grows compactly with fine, greenish foliage. The plant produces small, drooping flower plumes in green to yellowish-green, quite different from red varieties. These subtle flowers appear from September through October.

The real value lies in the attractive foliage present throughout the season. The plant forms small, inconspicuous seeds in brown seed capsules.

Ideal location

Choose the warmest spot in your garden for Argentine amaranth. At least 5-7 hours of direct sunlight daily. Against south-facing walls this plant thrives excellently. The plant can grow in partial shade but won't reach full spread there.

Protection from strong winds helps, though the plant is quite wind-tolerant due to its low growth.

Soil requirements

Argentine amaranth grows on virtually any soil. Well-draining soil is preferred - wet situations create problems. Sandy soil is well tolerated. Heavy clay benefits from some compost to promote water passage.

A pH between 6.0 and 7.5 is ideal. Poor soil is tolerated without issues.

Watering

Argentine amaranth is fairly drought-tolerant once established. Water regularly the first 3-4 weeks. Afterward, the plant tolerates moderate dryness. In extremely dry summers, regular watering promotes better growth.

Excessive water is not well tolerated. Ensure well-draining soil.

Pruning & maintenance

Pruning is not needed. The plant grows into a neat, spread form naturally. Remove only dead or damaged leaves.

The plant is virtually pest-free. No fertilizing needed, though moderate feeding in June can stimulate growth.

Maintenance calendar

April-May: Sow seeds directly or plant young specimens after last frost. June-July: Water regularly in early period. Plant grows faster in heat. August-October: Plant blooms subtly. Reduce watering as needed. October-November: Plant dies with first frost.

Winter hardiness

Argentine amaranth is annual and not cold-hardy. Dies at first frost around -5°C. Normal occurrence. For recurring growth, save seeds or purchase fresh seed.

The plant thrives in USDA zones 5-11.

Companion plants

Argentine amaranth combines well with:

• Other low growers like Sedum
• Silver-leaved plants like Artemisia
• Hot colors like Zinnia
• Ornamental grasses like Stipa

The plant provides quiet contrast in mixed borders.

Closing

Argentine amaranth is an underrated ground cover for those able to provide plenty of warmth and drainage. On gardenworld.app, find more ideas how to integrate this plant into your design for a more natural, warm-region appearance.