How to Grow Fireglow
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Fireglow
Amaranthus cruentus 'Fireglow'
flowerFireglow is a stunning ornamental amaranth variety prized for its dramatic deep red and burgundy flower spikes that emerge in mid to late summer. The feathery, velvety flower heads create a striking vertical accent in gardens and are excellent for fresh and dried arrangements. This heat-loving annual thrives in warm conditions and attracts pollinators while adding bold color to any garden scheme.
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Example Fireglow timeline · Pittsburgh, PA (Zone 6b)
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Plant Fireglow
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Fireglow blooms
Around Jun 26≈ 70 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Fireglow dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Grows as annual in zones 2-11; thrives in warm climates (zones 5-10)
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Get my Fireglow timeline →Growth Stages
Seedling
2-3 weeksTiny seedlings emerge with simple oval cotyledons. First true leaves appear thin and light green.
Keep soil consistently moist but not waterlogged. Provide bright light and moderate warmth (70-75°F). Thin seedlings to proper spacing once 2-3 inches tall.
Vegetative
4-6 weeksPlant develops sturdy upright stems with elongated, lance-shaped leaves. Foliage is green to reddish-green, and plant continues rapid height gain.
Ensure full sun exposure and consistent warmth. Water regularly but avoid waterlogging. Pinch tops when 6 inches tall if bushier plants are desired. Fertilize monthly with balanced fertilizer.
Bud Formation
2-3 weeksDense flower buds begin forming at stem tips and upper leaf axils. Buds initially appear green, then begin showing red coloring.
Reduce watering slightly to concentrate flavors and deepen color. Continue full sun exposure. Do not overwater—stress slightly improves deep coloration.
Flowering
4-6 weeksSpectacular deep red to burgundy velvety flower spikes fully emerge and mature. Feathery plumes reach their most intense color and size.
Minimal water needed; only water if leaves begin to wilt. Full sun required for best color. Deadhead lower spent flowers to encourage extended blooming and denser flower heads.
Seed Production & Decline
4-8 weeksFlowers dry out naturally on the stem. Flower heads become brown-tinged with visible seed development. Plant growth slows or stops.
Stop fertilizing. Minimal watering. Allow flowers to remain on plant for ornamental interest or harvest for seeds and dried arrangements. Plant will decline with first frost.
Common Pests
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Increase humidity, spray with water, use insecticidal soap or neem oil if severe
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Spray with strong water stream, apply insecticidal soap or neem oil, introduce ladybugs
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and
Hand-pick, use copper barriers, beer traps, or slug pellets; reduce watering frequency
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Improve air circulation, avoid overhead watering, remove affected leaves, apply fungicide if needed
Uses
Cut & Dried Flowers
CraftFireglow flowers are exceptional for fresh and dried floral arrangements, lasting weeks when dried. The vibrant deep red color remains vivid and is perfect for winter arrangements, wedding decor, and long-lasting bouquets. [source]
Edible Flowers & Grains
CulinaryBoth flower heads and seeds are edible and nutritious. Seeds can be popped like popcorn or cooked as a grain similar to quinoa, offering a complete protein source. [source]
Pollinator & Bird Attraction
WildlifeFireglow blooms attract butterflies, bees, and hummingbirds throughout the summer and fall. Mature seeds provide food for goldfinches and other seed-eating birds. [source]
Nutritional & Traditional Use
MedicinalAmaranth leaves and seeds are nutrient-dense superfoods rich in amino acids, calcium, and iron. Historically used in traditional medicine for various wellness purposes. [source]
Natural Dye Source
HouseholdThe deep red pigments in Fireglow flowers can be used to create natural dyes for fabrics and crafts, offering an eco-friendly coloring alternative. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
For dried arrangements, cut flower spikes when fully colored and mature (mid-late summer through early fall). Cut in early morning after dew dries. Hang upside down in a warm, dry location for 2-3 weeks until completely crisp. For seeds, allow flower heads to fully dry on plant, then cut and hang in paper bag to dry completely before extracting seeds.
Fun Facts
- 🌱 Amaranth has been cultivated for over 8,000 years, originally domesticated by the Aztecs who called it 'huautli' and valued it as a sacred grain and food source.
- 🌱 The name 'Fireglow' perfectly describes the flower's appearance—the intensely colored spikes seem to glow like embers, becoming even more vivid in full sunlight and cool fall temperatures.
- 🌱 Amaranth is an exceptionally heat and drought-tolerant plant, thriving in conditions where many ornamentals struggle, making it ideal for xeriscaping and low-water gardens.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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