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 to expect
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.
Common problems
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.
Where this fits in your garden
Gomphrena isn’t linked to specific companions or antagonists in our data — see the full companion guide for gomphrena for how it’s tracked. 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.
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.
Method: Start indoors — Start indoors from seed, then transplant outside — Gomphrena (Globe Amaranth) needs a head start most zones can't give it by direct-sowing alone.
See exact start-indoors, direct-sow, and harvest dates for your zone →
Spacing: 1 per square foot (square-foot-gardening spacing).
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)
Cited from the source shown next to each variety — we haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement.
Where to buy gomphrena (globe amaranth) seeds
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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)