Ornamental · Amaranthaceae
Celosia
Celosia argentea
Give it full sun and warm, well-drained soil, and celosia lifts flame-bright plumes that carry a border from summer to frost.
Full sun
USDA 2–11
0–3 ft · 0.2–0.9 m
Overview
Few annuals bring a border to life the way celosia does. Its flower heads take three distinct silhouettes depending on the type, from soft feathery plumes to the velvety folded crests that read so unmistakably as a rooster's comb, and the palette runs warm through reds, golds, oranges, and pinks. A member of the amaranth family, it grows fast enough to take a planting from a spring sowing to a full, glowing display in one season.
This is a plant for the sunniest corner of a garden, the kind of spot a patio or a south-facing bed offers in abundance. Native to warm regions, celosia takes drought and dry soil in stride and asks chiefly for warm, well-drained ground and an open situation where the light falls full. Cold and a soggy root run are the two settings it never settles into, so the right placement does most of the work.
It earns a place in the home as readily as in the bed. The blooms hold their color cut for an arrangement or hung to dry for a winter mantel, and the same species is grown as a leafy green called Lagos spinach across much of Africa and Asia. Because the whole plant is non-toxic, it slots without worry into a garden, and a household, shared with pets and children.
Care
The short version: a sunny, well-drained spot in warm soil, steady water while young and a relaxed hand once settled, a light monthly feed, and a regular deadheading to keep the display fresh.
Light
Celosia is a creature of full sun, and the brighter the situation, the better it performs. Reserve it an open spot with at least 6 hours of sun, since shade leaves the planting leggy and the plumes pale and thin, a poor return on a feature plant.
Water
Keep the soil evenly moist while the plants are young and finding their feet, then ease back and water only once the top inch or so has dried. It carries heat and drought with composure once established, but it has no patience for wet feet, which rot the roots, so a freely draining bed is the foundation of the display.
Soil
Plant it in moderately fertile, humus-rich soil that drains freely. The richness underpins the bloom, yet the drainage is what carries the planting, since soggy or cold wet soil is what invites root and stem rot into an otherwise handsome stand.
Humidity
Ordinary outdoor air suits it, so there is no figure to chase. Airflow earns its keep more than humidity here, because crowded, damp foliage in muggy weather is where leaf spot and flower rot quietly take hold and spoil the look.
Feeding
Celosia is a light feeder, so a single monthly feed across the growing season keeps the planting in form. A restrained hand serves it best, since over-rich, soggy conditions court root rot far sooner than they bring larger plumes.
Pruning
Deadhead the spent flower heads to keep the display turning over fresh through the season. Lift away any damaged or diseased growth as it appears, which keeps the planting clean, open, and worth a second look.
Size & spacing
Plants range from 6 to 36 inches (15 to 91 cm) tall by type, from dwarf crested forms that edge a path to tall cutting varieties that anchor the back of a bed. Each occupies about 6 to 18 inches (15 to 46 cm), so allow that much room for air to move and for the planting to read as composed rather than crowded.
When to plant
Celosia keeps to a warm-weather rhythm and turns its back on frost, which makes it a plant for the height of the season. Sow indoors in early spring, settle the young plants outside once the chill has lifted and the soil has warmed, and the plumes will hold the show from early summer to the first fall frost.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: Start indoors about 6 to 8 weeks before the last spring frost.
- Plant: Set out or direct sow after the last spring frost once soil has warmed.
- Harvest: Early summer to the first fall frost.
Hardiness
USDA hardiness zones: 2–11
Temperature: down to -46°C
Troubleshooting
Most of what unsettles a celosia display traces to two things, too much wet and too much cold. A passing glance at the leaves and the base of the plant catches the earliest signs, so match what you notice below and tend to it before it spreads through the planting.
A sudden slump and darkened stem foot in sodden beds
When a celosia wilts and goes down with a blackened stem base, the cause is usually root and stem rot taking hold in cold, waterlogged ground. There is no reviving a plant once the roots have gone to mush, so lift it and discard it. The remedy lies in the soil, so ease off the water, improve the drainage, and replant only where the ground is warm and freely draining.
Fix:
- Remove and discard affected plants
- Stop overwatering and improve soil drainage
- Replant only in warm, well-drained soil
Foliage dulling to bronze beneath a haze of webbing
Hot, dry, dusty spells set the stage for spider mites, which draw the green from the leaves until the planting bronzes and dulls. Turn a leaf and you may find tiny specks moving in a faint web. Wash them off with a strong spray of water, follow with insecticidal soap or horticultural oil, and keep the bed watered so drought stress never opens the door to them again.
Fix:
- Rinse foliage with a strong spray of water to dislodge mites
- Treat with insecticidal soap or horticultural oil, repeating as directed
- Remove and discard heavily infested leaves
Spotted leaves and rotting flower heads
Defined spots on the leaves, sometimes with flower heads softening, point to fungal leaf spot, which favors humid, rainy weather and crowded beds. Strip away the marked leaves and any rotted blooms so the spores have less to travel to. Give the planting room for air to move and water at the base, since dry foliage is the surest way to keep the display intact.
Fix:
- Remove and discard spotted leaves and rotted flower heads
- Improve air circulation by spacing or thinning plants
- Water at the base to keep foliage dry
Miniature plants opening their blooms before their time
Celosia takes a setback poorly, and a cold spell or a rough move imposes a growth check that holds the plant small and pushes it into early bloom on stubby stems. A badly checked plant rarely recovers its proportions, so a fresh young transplant is often the quicker route back to a good display. Sow into warm soil, raise seedlings warm and on the dry side, and set them out small and untroubled.
Fix:
- Replace severely checked plants with fresh young transplants
- Keep new plantings warm and unstressed to encourage recovery
A sticky gloss and clustered pests along the newest stems
Those clustered specks at the shoot tips are aphids, and the sheen they leave behind is honeydew. A few pass unnoticed, but a colony curls the new leaves and dulls the look of the planting. Rinse them off with a firm spray, treat the worst spots with insecticidal soap, and let lady beetles round out the work.
Fix:
- Knock aphids off with a strong water spray
- Apply insecticidal soap to affected growth
- Encourage or release natural predators such as lady beetles
Toxicity
For a home that includes animals, celosia sits easy on the conscience: it is non-toxic to cats, dogs, and horses, with the ASPCA to vouch for it. The same plant turns up on the table as an edible green, so nothing in this border needs to be fenced off from pets, livestock, or children.
Safe for
People · Cats · Dogs · Horses · Rabbits · Livestock · Birds
Cats None
The ASPCA lists celosia as non-toxic to cats, so a nibbled plume or leaf calls for no concern around the home. A cat that overindulges on any plant may still bring it back up from the roughage alone.
Dogs None
Celosia is non-toxic to dogs, and a curious chew on the foliage or flowers does no harm. A large mouthful might pass with a mildly upset stomach, as it would with any plant in the garden.
Horses None
The ASPCA rates celosia safe for horses, so it poses no poisoning risk in or near a paddock. Nothing about it calls for special fencing.
Rabbits Safe
A rabbit nibbling at a celosia bed comes to no harm, and in many kitchens the foliage even appears as a cooked green. As with anything fresh added to their diet, offer it gradually so a delicate digestion stays in balance.
Livestock Safe
Cattle, goats, and sheep face no toxic threat from celosia, and the species is grown as a leaf vegetable for people across parts of Africa and Asia. Browsing it causes no poisoning.
Birds Safe
Whether it is a caged companion or a visitor to the garden, a bird sampling the seeds or leaves faces no risk. Nothing in celosia works against them.
People Safe
Celosia is safe around children, and the young leaves and shoots are a common cooked green known as Lagos spinach. No part of the plant gives cause for worry.
Varieties
Celosia arranges itself into three groups by the line of its flower head, and a few named series recur in the best plantings. These are the ones worth knowing as you compose a scheme.
'Century' and 'Fresh Look' (Plumosa Group)
These plume types carry upright, densely packed feathery heads in red, gold, orange, and pink that hold their color whether arranged fresh or hung to dry.
'New Look' (Plumosa Group)
It sets feathery red plumes against bronze-purple foliage on neat, compact plants that edge a bed cleanly.
Jewel Box Series (Cristata Group)
A dwarf crested cockscomb of only about 6 to 8 inches, topped with dense brain-like crests that suit the front of a border.
Big Chief Series (Cristata Group)
A tall crested cockscomb reaching about 36 inches, a strong choice for the cutting garden.
'Flamingo Feather' (Spicata Group)
A wheat celosia that lifts slender, upright spikes shading from pink to white like heads of grain.
How to propagate
Celosia comes from seed and little else, and it rises quickly once the soil has warmed, which makes the start of a planting an unhurried pleasure.
SeedEasy
Start indoors about 6 to 8 weeks before the last spring frost, or direct sow after frost once soil is warm (70 to 75°F). · Germinates in about 1 week at 70 to 75°F and blooms the same season.
Celosia takes to seed with ease, which makes starting a planting a simple affair. Sow indoors about 6 to 8 weeks before the last spring frost, or sow straight into the bed once the soil has warmed to 70°F to 75°F (21°C to 24°C), and the seedlings rise in roughly a week. Keep them warm and on the dry side and set them out while young and small, since a chill or a late transplant stunts the plant and tips it into early bloom. From a spring sowing the display flowers the same season.
Myths
Celosia is poisonous to pets.
The ASPCA lists celosia as non-toxic to cats, dogs, and horses, so a curious nibble poses no danger to the animals of the house. The plant is safe to grow throughout a household. The species is even raised as a leafy green for the table.
Celosia may be relocated at leisure, whatever its size.
It has little patience for cold or transplant shock, and a chilled or jostled plant stalls and rushes into bloom on short, stunted stems. Sow in warm soil and set the plants out young and small after the last frost. Move it too late or too roughly and the planting carries a runt all season.
Celosia demands a bed kept lavishly fed and always damp.
It shrugs off heat and drought and asks only for warm, well-drained ground. Soggy or cold wet soil is what brings on root and stem rot. Keep the bed on the lean and dry side once the plants are established and the display holds.