Croton

Check your light →

An east or west window with some direct sun keeps its leaves blazing and the plant full, though strong sun can fade them. Bright shade works too, but the colors dull and lower leaves may drop.

Its new leaves open mostly green and pick up their yellows, oranges, and reds as they mature, as long as the light is there (UF/IFAS). So watch the top of the plant: if fresh growth stays green weeks after it opens, the spot is likely too dim, and in time the older, painted leaves can slip back toward green too (University of Wisconsin Extension).

Too much can wash it out as well. Strong sun can fade the reds and oranges and leave a gray, chalky cast on the leaves (UF/IFAS; University of Wisconsin Extension). Bleached rather than green means the spot is too harsh, not too dark.

Picking one for a dimmer room? UF names 'Petra' as a cultivar that holds its color indoors, though even it loses some without enough light.

Its newest leaves are the gauge: green ones ask for more sun, gray ones for less.

Every 5-7 days from spring to fall, letting the surface dry slightly between, and every 7-10 days in winter. Leave it dry too long and it drops its bottom leaves; keep it soggy and it can wilt.

When you do water, be generous: NC State says to water it liberally through the growing months, so the whole root ball gets a drink, and to go sparingly once winter comes. Missouri Botanical Garden frames the same rhythm as soil kept moist but not wet, with less water from fall to late winter.

Cold worries it as much as thirst does. It does best between 60 and 85°F (University of Wisconsin Extension), and if it spends summer outdoors, NC State says to bring it inside once temperatures fall to 50°F.

A croton that wilts while its pot is still wet is likely overwatered (UF/IFAS), not parched, so hold off on the next drink and give it time.

Gone for a while? Ten days is fine if it’s watered the day you leave.

A full, branching shrub 2-3 feet tall, its leaves clustered toward the tips of the stems. Set it on a wide sunny sill or a sturdy stand, or among plain green plants, where it does all the decorating.

Wild crotons grow into shrubs 8-10 feet tall (NC State; UF/IFAS), and the potted one keeps the woody build. Young stems are green; older ones turn brown and woody, pocked with oval scars where leaves once grew (NC State).

In a dim corner those bare, scarred stretches lengthen and the plant goes loose; more light makes a more compact croton (University of Wisconsin Extension).

Cut a stem and it bleeds milky sap. That cut can root: UC Master Gardeners suggest letting it scab over, dipping it in rooting hormone, and covering the pot with a plastic bag to hold humidity until it takes.

In a room of ferns and philodendrons, it’s the one warm note: reds and oranges where everything else is green.

A chewed leaf may bring on drooling, vomiting, or diarrhea in a dog or cat; Pet Poison Helpline calls it mild. For kids, NC State rates it low severity, a concern only in large amounts, and the sap can irritate skin.

Its milky sap can irritate skin, and sap in an eye is painful.

Its defense is chemical. NC State names diterpene esters as the irritant, carried in every part of the plant. A brush with the sap usually stings for a few minutes at most; handle it often, though, and an allergic rash can develop after repeated contact (NC State).

A nibble usually settles at home with nothing more than time. If symptoms don’t settle, or anything worries you, Poison Control can help with a child, and your vet or the ASPCA Animal Poison Control Center (a fee may apply) for a pet.

With a crawler or a chewer at home, give it a sunny sill they can’t reach, and wear gloves when you prune, as the RHS suggests.

1. Pet Poison Helpline: mild for dogs.
2. Pet Poison Helpline: mild for cats.
3. NC State Extension: mild for kids.

Cats and dogs: Most of the leading sources agree.

Kids: No poison-centre listing; rated from university extension sources.

Happiest at 60-85°F, and it shouldn’t sit below 50°F. It wants at least 40% humidity.

Temperature

60-85°F

Spider mites hide on leaf undersides, mealybugs in leaf axils and along stems, and scale on leaf stalks and twigs. Thrips sometimes visit the leaf surfaces. Flip a leaf when you water to spot trouble early.

• Spider mites
• Mealybugs
• Scale insects
• Thrips

Spider mites are its big enemy, especially in dry winter air; mealybugs, scale, and thrips turn up now and then.

Spider mites leave pale speckles and fine webbing, and the colors go dull. Rinse the whole plant in the shower now and then, undersides of the leaves included; if they come back, an insecticidal soap spray is the next step.

Thrips are tiny, slender insects that turn leaves silvery and speckled; rinse them off the same way.

Mealybugs look like tufts of white cotton where the leaves meet the stem; scale looks like small brown bumps. Wipe them off with a cotton swab dipped in rubbing alcohol, then check again next week.

Rinse the leaves 4 times a year, in shade, which also helps against mites, and feed once or twice in spring and summer. In early spring, cut leggy stems back to about 4 inches and repot 1-2 inches up.

• Feed2× a year
• Prune1× a year
• Repot1× a year
• Clean leaves4× a year

A rich potting mix that drains fast, in a pot with a drainage hole.

Repot when it outgrows its pot, in spring, into a pot only an inch or two wider.

Food helps it grow: a houseplant fertilizer once or twice in spring and summer, or more often if you want it bigger faster, and none in winter.

Green leaves wear splashes of red, orange, and gold, with a glossy, waxy finish. Branching stems carry them in clusters, and the soil stays partly visible beneath.