Gadenin日本語Get the appThe year at a glance
Anthurium has no true dormancy. It grows whenever it is warm and bright enough and pauses when it is not, which in most homes means a long active season and a quiet winter. Everything that stresses the plant belongs in the warm half of the year.
| Season | Watering | Feeding | Main jobs |
|---|---|---|---|
| Spring | Every five to seven days | Start at half strength once new growth shows | Repot, divide, take cuttings, move back to the window |
| Summer | Every three to five days | Every two to four weeks, half strength | Shade from direct sun, raise humidity, watch for mites |
| Autumn | Every eight to twelve days | Last feed in early autumn, then stop | Move back towards the light, clean the leaves |
| Winter | Every two to three weeks | None | Keep warm and off cold glass. No cutting, no repotting |
These intervals assume a room in the ranges given later on this page. A consistently heated flat runs a season ahead of an unheated one, so read the plant, not the month.
Spring is when the work happens
As light strengthens and the room warms past about 68F (20C), the plant starts moving and can replace roots you disturb. This is the window for repotting, for dividing, and for taking any cutting you have been putting off. Doing all of it in one afternoon in late spring is far better than spreading it through the year.
Start feeding when you see a new leaf beginning, not on a date. Half strength, every two to four weeks, using a feed with a decent phosphorus figure rather than a high nitrogen one. Feeding a plant that has not started to move only loads salts into the mix.
- Move it back to the brightest spot The position that was too bright last summer is usually right again in spring. Light now is what produces flowers in early summer.
- Repot only if it needs it Check for a rising crown, water running straight through, or a collapsed mix. If none apply, leave it. Anthurium flowers better slightly snug.
- Clean every leaf Wipe both surfaces with a damp cloth. It restores light transmission after winter and it is when you find the first mites of the year.
Summer
Growth and water use are at their peak, and so is the risk of scorch. Move the plant back from the glass or add a sheer layer, because summer sun through a window will bleach and then burn the leaves in a single afternoon. Water in the morning rather than at midday, and keep an eye on the pot in a hot week: the interval can halve.
Heat with dry air is the combination that causes trouble. Above about 90F (32C) with low humidity, flowers abort and leaf edges crisp. Group plants, use a pebble tray, and ease off the feeding during a genuine heatwave, because fertilizer on roots that are already struggling does damage rather than good.
Spider mites build fastest in hot dry air. Check the leaf undersides weekly through summer rather than monthly, and deal with the first ones you find.
Autumn, and not leaving the switch too late
As the sun weakens, the summer position becomes too dark. Move the plant back towards the window well before you feel you need to, because anthurium responds on a delay and a month spent too dark in autumn costs you flowers later.
At the same time start stretching the watering interval. The plant is using less, the pot dries slower, and continuing to water on the summer rhythm through a cooling autumn is the single most common route into winter root rot. Give the last feed in early autumn and then stop entirely.
- Bring in anything that summered outside Once nights approach 60F (16C), bring it in. Wash the leaf undersides and check the base of the pot first so you do not import pests.
- Cut spent flower stalks at the base Old spathes that have gone green and papery are drawing resources. Remove them cleanly at the base with sterilized snips.
- Decide the winter position now Work out where the plant will sit before the heating goes on, so you are not moving it in a hurry into the first bright spot you find, which is usually a cold window sill.
Winter is about holding, not growing
The winter job is to keep the plant in good condition until spring, not to push it. Water rarely and thoroughly, do not feed at all, do not repot, do not divide and do not take cuttings. Almost every winter anthurium loss is watering on an autumn schedule into a cold, slow pot.
Guard the two things that actually cause damage: cold and moving air. Move the plant off the window sill at night, keep it at least three feet from any radiator or heating vent, and raise the humidity to offset the dryness of heated air. Losing one older leaf over the winter is normal turnover. Losing several is a root problem and needs the pot checked.
| Winter condition | What you will see | What to do |
|---|---|---|
| Nights below 55F (13C) | Blackened leaf edges and stalk bases | Move the plant into the room and off the glass |
| Heated dry air | Brown crisp leaf tips on healthy leaves | Pebble tray or humidifier. Do not water more often |
| Watering on the summer rhythm | Limp plant, wet mix, yellowing lower leaves | Stop, let it dry hard, check the roots |
| Very low light | No new leaves at all for months | Acceptable in winter. Improve it in spring rather than feeding now |
Adjusting the calendar to your conditions
The seasons above are a shape, not a prescription. What actually drives the plant is the temperature and light in the specific room it lives in, and two homes in the same street can run a month apart.
| Your situation | Active season | Winter concern | Adjustment |
|---|---|---|---|
| Warm home, heated all winter | Nearly all year | Dry air and salt build up | Keep a light feed going into late autumn, flush the pot twice a year |
| Average home, cool at night | Late spring to early autumn | Cold nights at the window | Move it off the sill each night from mid autumn |
| Cool or unheated room | Early summer to late summer | It may not hold below 55F (13C) | Relocate it for winter rather than trying to insulate the pot |
| Under a grow light | All year, unchanged | None, if the room stays warm | Keep feeding and watering at the spring rhythm throughout |
The commonest mistake is feeding through winter to make up for a slow autumn. Fertilizer on a plant that is not growing accumulates in the mix and burns roots. Wait for the first new leaf of spring.
Keeping a year's record
Four dates a year are enough to make next year much easier: the date of the first new leaf in spring, the date of the first flower, the date you repotted or divided, and the date you gave the last feed of the season. Add the coldest night reading at the plant's position.
With those written down you can answer the questions that otherwise stay guesswork. Whether the plant is flowering earlier or later than last year, whether the repot two springs ago helped, and whether the winter position you tried was actually warm enough.