Globe amaranth (Gomphrena globosa) is a popular annual known for its vibrant, clover-like blooms. These colorful flowers, which are actually papery bracts, add a cheerful touch to gardens. Gardeners appreciate globe amaranth for its long-lasting flowering period, extending from early summer until the first frost. Its hardiness and beauty make it a favored choice for beds, borders, and containers, attracting beneficial pollinators like butterflies.
Getting Started with Globe Amaranth
Globe amaranth is a warm-season annual sensitive to frost. Planting should occur after all danger of frost has passed and soil temperatures have warmed to at least 15°C (60°F). For an earlier bloom, seeds can be started indoors six to eight weeks before the last expected spring frost. Soaking seeds in warm water for 24-48 hours before sowing can help speed up germination, which typically takes 7-14 days.
When transplanting or direct sowing, choose a location that receives full sun, at least six to eight hours of direct sunlight daily. Insufficient light can lead to leggy growth and fewer flowers. Globe amaranth prefers average, well-draining soil and can tolerate various soil types, including sandy or poor soil, provided drainage is good. If your soil is heavy clay, amending it with compost or other organic matter will improve drainage and provide some initial nutrients. Space plants 6 to 18 inches apart, depending on the variety, for adequate air circulation and growth.
Essential Care for Thriving Globe Amaranth
Once established, globe amaranth is known for its drought tolerance, making it low-maintenance. For optimal vigor and continuous flowering, consistent watering is beneficial, especially during dry spells. Water deeply when the top 1 inch (2-3 cm) of soil feels dry to the touch, ensuring moist, not soggy, soil. Watering at the base of the plant helps prevent fungal diseases by keeping foliage dry.
Globe amaranth is not a heavy feeder and does not require extensive fertilization. Incorporating compost or organic matter at planting time usually provides enough nourishment for the growing season. If soil is particularly poor, a light application of a balanced, slow-release granular fertilizer at planting or a water-soluble fertilizer every 2-3 weeks can encourage more prolific blooming. Avoid over-fertilizing, as this can lead to excessive foliage growth at the expense of flowers.
Maintenance and Common Issues
Removing spent blooms can promote a tidier appearance and may encourage additional flower production. If deadheading, cut the flower at the base of its stem, just above a leaf node. Pinching back young plants when about 6 inches tall encourages bushier growth, especially for taller varieties.
Globe amaranth is resistant to most common insect pests and is not favored by deer. Aphids and spider mites can be a concern, particularly on new growth. A strong spray of water can dislodge these pests, or insecticidal soap can be used for significant infestations. Fungal diseases like powdery mildew and leaf spot can occur in cool, damp conditions or with poor air circulation. Ensuring good air circulation through proper spacing and watering at the soil line helps prevent these issues.
Harvesting and Enjoying Globe Amaranth
Globe amaranth flowers are highly versatile and can be enjoyed both fresh and dried. For fresh arrangements, harvest blooms when fully open and vibrant. Regularly cutting stems will encourage the plant to produce more flowers throughout the season. These flowers hold their color and shape exceptionally well, making them excellent for drying.
To dry globe amaranth, cut stems when flowers are completely open, strip off the leaves, and tie them in small bunches. Hang these bunches upside down in a warm, dry, well-ventilated area away from direct sunlight. Drying typically takes about a month, after which the flowers will feel light and rigid to the touch. Once dried, they can be used indefinitely in arrangements, wreaths, or other crafts, providing lasting color and a unique texture.