Green Thumb Amaranth is a vibrant flowering variety that thrives in zones 3-11, bringing color to gardens from summer through fall. This frost-tender annual reaches 12 to 24 inches tall with a compact 12 to 18-inch spread, making it easy to fit into borders and beds. From seed to bloom takes just 84 days, and once established, this amaranth handles drought remarkably well, requiring minimal water input. The plant flourishes in full sun and tolerant, well-draining soil with a pH between 6.0 and 7.5.
Full Sun
Low
3-11
24in H x 18in W
—
Moderate
Hover over chart points for details
Green Thumb Amaranth earned its name honestly: it's a low-maintenance performer that handles dry conditions with grace while still producing abundant summer-to-fall blooms. Germinating quickly at warm temperatures between 65 and 85°F, it moves from seed to flowering stage in just 84 days. Its compact stature makes it excellent for containers, borders, and smaller garden spaces, and the extended bloom window from June through November gives you months of color without constant fussing.
No timeline data available yet for this variety.
Start seeds indoors six weeks before your last frost date. Sow thinly into seed-starting mix, barely covering seeds at a depth of 1/16 inch. Keep soil evenly moist and maintain temperatures between 65 and 75°F. Use a humidity dome or place a thin layer of vermiculite over pots to prevent damping off and retain moisture. Germination typically occurs within 3 to 14 days.
Transplant seedlings outdoors after your last frost date has passed, hardening them off gradually to outdoor conditions. Space plants 1 inch apart in prepared beds or containers.
Direct sow seeds outdoors after your last frost date, barely covering them with soil at 1/16 inch depth.
Enter your ZIP code to see a personalized growing calendar for this plant.