- Season: Annual
- USDA Zones: 3 - 10
- Height: 60 inches
- Bloom Season: Summer
- Bloom Color: Red
- Environment: Full sun
- Soil Type: Well-drained, pH 6.1 to 6.5
- Temperature: 65 - 75F
- Average Germ Time: 10 - 21 days
- Light Required: Yes
- Depth: Press seed into soil, do not cover
- Sowing Rate: 4 - 5 seeds per plant
- Moisture: Keep seeds moist until germination
- Plant Spacing: 48 - 60 inches
Amaranthus Cruentus (Red Spike) - This Amarathus plant features dark red flowers on dark red upright foliage. It truly is one of the most unique Amaranthus Cruentus plants you can grow from flower seeds! It will grow 60 inches tall in just a few months when planted in warm temperatures. Amaranthus Red Spike will bear somewhat fuzzy-looking spires of dark red flowers in summer, followed by seed heads that will also be red in appearance.
In areas with a long growing season, start Amaranthus seeds directly outside in a prepared seedbed after frost season is over. To get a jump start on the growing season, Amaranthus flower seed can be started indoors 6 - 8 weeks before the last frost is expected and then transplanted outdoors. Amaranthus plants grow best in full sun. They prefer moderately fertile, moist soil with lots of organic matter. During dry spells, water freely to prolong the flowering period.