Growing Gomphrena (Globe Amaranth): A Complete Profile
By Growing Home Greens Team · July 18, 2026
Gomphrena (globe amaranth) grows a long taproot that gives it above-average drought tolerance once established, and it rewards that patience with one of the longest bloom windows of any flower on this list: April through October in a lot of climates. What look like its “flowers” are papery bracts, not petals, which is why cut stems hung upside down hold their color and shape for months in a dried arrangement instead of shattering the way true petals do.
Starting it, and waiting on the taproot
Start indoors about 7 weeks before your last frost, with transplants going out a week after; seed goes about 1/4 inch deep. At a full plant per square foot, expect steady, unhurried growth early on while that taproot establishes. Gomphrena isn’t a fast starter, but it settles in for the long haul once it’s rooted in.
Slow growth early is the root, not a problem
Slow early growth is normal and not a sign of trouble; the plant is investing in root development before it puts on top growth. Poor drought tolerance in year one usually just means the taproot hasn’t had time to establish yet. Consistent watering early on pays off later in the season when you can ease up.
Color from spring clear through fall
Gomphrena has no well-established companion pairings, and nothing it needs to be kept away from. At 1 per square foot with a long season of bloom, it’s a reliable standard-density filler in the Garden Designer for beds that need color from spring clear through fall, well-suited to a hot, dry spot like a south-facing wall strip where less drought-tolerant flowers would struggle.
Companion planting guide for Gomphrena (Globe Amaranth) · Find your planting dates
Typically viable in USDA zones 2-11. Not sure your zone? Look it up by ZIP code.
Mature height: 1-2 ft
Method: Start indoors: Start indoors from seed, then transplant outside. It needs a head start most zones can't give it by direct-sowing alone.
When to plant gomphrena (globe amaranth), by zone
Every zone gomphrena (globe amaranth) grows in. Pick your zone in the header and it will be highlighted here. Each zone links to its full page.
| Zone | Start indoors | Sow or plant out | Bloom |
|---|---|---|---|
| 2a & 2b | Apr 1–Apr 8 | May 27–Jun 3 | Aug 25–Sep 1 |
| 3a & 3b | Apr 11–Apr 18 | Jun 6–Jun 13 | Sep 4–Sep 11 |
| 4a & 4b | Mar 27–Apr 3 | May 22–May 29 | Aug 20–Aug 27 |
| 5a & 5b | Mar 22–Mar 29 | May 17–May 24 | Aug 15–Aug 22 |
| 6a & 6b | Mar 7–Mar 14 | May 2–May 9 | Jul 31–Aug 7 |
| 7a & 7b | Feb 20–Feb 27 | Apr 17–Apr 24 | Jul 16–Jul 23 |
| 8a & 8b | Feb 4–Feb 11 | Apr 1–Apr 8 | Jun 30–Jul 7 |
| 9a & 9b | Dec 28–Jan 4 | Feb 22–Mar 1 | May 23–May 30 |
| 10a & 10bSpring window | Jan–May | Mar–Jul | ~90 days after transplanting |
| 11a & 11b | Nov 13–Nov 20 | Jan 8–Jan 15 | Apr 8–Apr 15 |
Bloom dates are about 90 days after the sow or plant-out date, not after starting seeds indoors.
Zone 2 sows before zone 3 here, which looks wrong and is not. USDA zones rank winter cold, not season length, and zone 2 is mostly interior Alaska, where hard winters come with warm summers. More on what a zone measures.
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Gomphrena (Globe Amaranth) plants fit per square foot?
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Varieties worth considering
- Fireworks: NC State Extension's Plant Toolbox describes it as an amaranth with incredible drought and heat tolerance and a long bloom season, growing 3-4 feet tall, taller than most gomphrena, so plan for it at the back of a bed rather than the front. (source) Buy seeds: Burpee
- Buddy series: NC State's Plant Toolbox lists this as a true dwarf at 9-12 inches in purple, rose or white, a fraction of Fireworks' height. The pick for a square-foot bed where Fireworks would tower over its neighbors. (source)
- Ping Pong series: A medium-tall type NC State lists at 16-20 inches in pink, purple or white, between Buddy's dwarf habit and Fireworks' 3-4 feet. Suited to a middle-of-bed spot neither of the other two fits well. (source)
Why each variety is listed comes from the source shown next to it. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement. The buy links are separate from those sources: they go to seed suppliers that sell that exact variety, and we may earn a commission on some of them.
Where to buy gomphrena seeds
Botanical Interests · True Leaf Market · Burpee (each supplier's gomphrena seeds)
The varieties we recommend above each have their own buy links, for the suppliers that sell that exact variety.
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See it growing
Search YouTube for "growing gomphrena (globe amaranth)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Gomphrena (Globe Amaranth): A long taproot gives this one above-average drought tolerance and a bloom season that runs April through October.
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