Gomphrena, commonly known as Globe Amaranth, belongs to the Amaranth family and are often grown as annual bedding plants. Their small globular flowerheads resemble clover flowers and are long blooming--they continually flower from early summer until first frost. Generally easy to grow and low-maintenance, they thrive in hot, dry weather.
Latin
Gomphrena globosa; Gomphrena haageana
Difficulty
Easy
Season & Zone
Season: Warm season
Exposure: Can tolerate some shade but best flowers in full-sun
Timing
Start seeds indoors 6-8 weeks before last frost date or direct sow after soil temperatures warm in spring. Optimal soil temparature 21-24°C (70-75°F). Seeds should germinate in 7-14 days. To speed up germination, seeds can be soaked in warm water for 24-48 hrs before planting.
Starting
Sow seeds in premoistened soil and lightly cover with seed starting mix. Place in a warm area in bright, but indirect light. Keep moist. Using heat mats will speed germination.
Days to Maturity
From sowing date.
Growing
Gomphrena are slow growers and they may take some time to set true leaves. Keep seedlings under lights until they have at least two sets of true leaves. Then, begin hardening off before transplanting, or pot them on to continue growing until outdoor temperatures are consistently warm. Gomphrena prefer well-draining soil with consistent moisture, but can handle a dry spell. They perform best in full sun, but can tolerate partial shade. Pinch back young plants when they are around 15cm (6") tall to encourage a bushier habit. Some taller varieties may need support to prevent them from falling over. Deadheading is not necessary, but cutting flowers regularly may result in more blooms.
Seed Info
Usual seed life: 2 years.