Ficus bonsai care comes down to three things: put the tree in the brightest spot you have and leave it there, water it generously whenever the top of the soil turns slightly dry, and keep it away from radiators and cold draughts. Do that and a ficus is very hard to kill. Bonsai Empire calls it the most popular indoor tree species for bonsai beginners, and the reason is that it tolerates the mistakes beginners make. Below is the full routine, with the winter indoor season first, because November is when most ficus trees get into trouble.
Which ficus do you have?
Most ficus bonsai sold in garden centres and supermarkets are Ficus microcarpa (also sold as Ficus retusa), the Chinese banyan or laurel fig. NC State Extension's plant toolbox entry for Ficus microcarpa lists the cultivars you'll see on labels:
- 'Ginseng' — the fat, bulbous root-trunk with glossy dark leaves. This is the "ficus ginseng" in most shops.
- 'Golden Gate' — grey trunk, small dark green oval leaves.
- 'Green Island' — a very popular houseplant form with glossy deep green leaves.
- 'Mini Flat Leaf' — dwarf and compact, with branches that grow out and down.
The care below applies to all of them, and to most other ficus grown as bonsai, such as the weeping fig (Ficus benjamina), willow leaf fig and Ficus 'Tiger Bark'.
Ficus bonsai care at a glance
| What | Summer | Winter (indoors) |
|---|---|---|
| Light | Full sun is fine; outside once nights stay above ~60°F (15°C) | Brightest window you have, south or west; add a grow light if it's dim |
| Water | Generously whenever the topsoil turns slightly dry; can be daily | Same rule, less often; the cooler the room, the drier it stays |
| Temperature | Warm; no special care | Steady room temperature; no frost, no cold draughts, no radiators |
| Humidity | Normal air is fine | Heating dries the air; a humidity tray helps |
| Feeding | Every two weeks | Every four weeks if it's still growing; stop if it isn't |
| Pruning | Let shoots grow 6–8 leaves, cut back to 2 | Light trims only |
| Repotting | Spring, about every other year | |
Feeding, pruning and repotting intervals are from Bonsai Empire's ficus care guide. Treat them as a starting point, not a rule: a tree in a dim room grows slowly and needs less of everything.
Light: the one thing a ficus can't do without
A ficus wants a lot of light — Bonsai Empire says preferably full sun — and most rooms are much darker than they look to us. A spot a couple of metres back from a window gets a fraction of the light on the sill. Indoors, that means:
- Right at the window, ideally south- or west-facing in the northern hemisphere. A north window is usually too dim on its own in winter.
- A grow light if your brightest window still isn't bright, or if the days are short where you live. A small LED panel a short distance above the canopy on a timer for 10–12 hours makes a real difference.
- Turn it a quarter every week or two so it doesn't lean and thin out on the room side.
Signs it needs more light: long gaps between leaves, new leaves that are larger and paler than the old ones, and a slow, steady drop of inner leaves.
Watering: by observation, not by schedule
Ignore the label that says "water daily". Bonsai Empire's guide is blunt about it: water on observation. Push a finger or a wooden chopstick a centimetre into the soil; if it's slightly dry, water. Water until it runs out of the drainage holes, wait a minute, and water again so the whole root ball is wet. Then leave it until it's slightly dry again.
- A ficus prefers soft, room-temperature water. Rainwater is ideal; tap water left out overnight is fine.
- It tolerates being a bit too wet or a bit too dry now and then. What it doesn't tolerate is soil that never dries: NC State lists root rot from overwatering among its problems.
- In winter, the warmer the room, the more water it needs. In a cool room, the soil only needs to stay slightly moist.
For watering in more depth, including how pot size and soil change the interval, see our guide to how often to water a bonsai tree.
Winter indoors: heating, draughts and humidity
Ficus is tropical. NC State describes Ficus microcarpa as a tree that needs a warm climate and humid air, and suited to temperatures above 68°F (20°C) all year, which is why it's sold as a houseplant. A normal heated room is fine. The trouble comes from the edges of the room:
- Radiators and heaters. A windowsill above a radiator is the classic ficus spot and the classic ficus problem: hot, dry air blowing straight through the leaves. Move it to the side of the radiator, or put a shelf between them.
- Cold glass and draughts. On a frosty night the air right against a single-glazed window, or by a door that opens to the outside, can be far colder than the room. Don't trap the tree between a closed curtain and the glass at night.
- Humidity. The thick, waxy leaves cope with dry air better than most indoor bonsai, but they prefer more humidity, and very high humidity is what drives the dangling aerial roots (NC State gives 70–100%). A shallow tray of gravel kept topped up with water under the pot helps. Bonsai Empire suggests misting, but warns that too much misting can cause fungal problems.
If your ficus spent summer outside, bring it in before nights drop below about 60°F (15°C), and expect it to shed some leaves in its first few weeks indoors. Our bonsai winter care guide covers the outdoor species that need the opposite treatment.
Why your ficus bonsai is losing leaves
A ficus drops leaves to match its light. Whenever its light changes — you bought it, moved it, brought it in for winter, or the days got shorter — it often sheds a batch, sometimes yellowing first, over one to three weeks, and then grows new leaves suited to the new spot. That drop is the tree adjusting, not dying. The worst response is to keep moving it around in search of a better place, because every move restarts the adjustment.
| What you see | Likely cause | What to do |
|---|---|---|
| A batch of leaves, some yellow, a week or two after a move | Adjusting to new light | Brightest spot, then leave it alone |
| Green leaves falling within days | Cold draught, heater, or the root ball dried out completely | Find the change and undo it; check the soil |
| Soft yellow leaves, soil always damp, sour smell | Overwatering, possibly root rot | Let it dry to slightly dry before watering again |
| Sticky leaves, fine webbing, white fluff or brown bumps | Pests: aphids, spider mites, mealybugs, scale | Wipe or rinse the leaves; treat with insecticidal soap |
| Long bare stems, new leaves large and pale | Not enough light over months | Move closer to the window or add a grow light |
The pest list is the one NC State gives for Ficus microcarpa. For a step-by-step read of a tree that's shedding, our free bonsai leaf check asks four questions, and the guides to bonsai dropping leaves and bonsai leaves turning yellow go into each cause in detail.
Feeding, pruning, wiring and repotting
- Feeding. Every two weeks in the growing season and every four weeks in winter if the tree is still putting out leaves. Liquid bonsai fertiliser or organic pellets both work. Don't feed a tree that's just dropped half its leaves; wait for new growth.
- Pruning. Let each shoot grow six to eight leaves, then cut it back to two. Ficus takes hard pruning well and buds back from old wood, so if you want a thicker trunk you can let it grow freely for a year or two and cut back afterwards. Its milky sap bleeds from cuts; Bonsai Empire suggests cut paste on larger wounds.
- Wiring. Thin and medium branches bend easily, but ficus thickens fast and wire can bite into the bark within weeks. Check it often. For thick branches, guy-wires anchored to the pot can stay on longer.
- Repotting. In spring, about every other year, into a free-draining bonsai soil. Ficus tolerates root pruning well. Avoid repotting in winter, when the tree is already dealing with low light.
Keep a record, and next winter is easier
Most ficus problems are about change: a new window, the heating coming on, a watering rhythm that drifted. The hardest part is remembering what you changed and when. A dated photo each time you move the tree, and a quick note when you water or feed, turns "it's losing leaves again" into "it did this last November too, and it was fine by January". That's what we built Bonsai for: a photo timeline and growth log for each tree, care logs in one tap, and care reminders on your Home Screen and Apple Watch that you set to your own intervals, because a ficus on a winter windowsill doesn't drink on a fixed schedule. It's free for up to three trees with five growth records each, with the Apple Watch app and widgets included; Premium, yearly or a one-time lifetime purchase, unlocks unlimited trees and records. No account, and your photos stay on your device and in your own iCloud.
Frequently asked questions
How do you take care of a ficus bonsai?
Give it the brightest spot you have, ideally a sunny window, and keep it there. Water it generously whenever the top of the soil turns slightly dry, rather than on a fixed schedule. Keep it away from radiators, heaters and cold draughts, feed it every two weeks in summer and about every four weeks in winter if it is still growing, prune shoots back to two leaves once they have grown six to eight, and repot it in spring about every other year.
How often should I water a ficus bonsai?
Water it when the soil feels slightly dry just below the surface, not by the calendar. In a warm, bright room in summer that can be every day or two; in a cooler room in winter it may be once a week or less. Water until it runs out of the drainage holes, then let the surface dry again. Bonsai Empire's ficus guide notes that the warmer the tree is kept in winter, the more water it needs, and that a ficus tolerates the occasional mistake in either direction.
Can a ficus bonsai live indoors all year?
Yes. Ficus is a tropical tree that cannot take frost, which is why it is the most common indoor bonsai. It grows best in strong light, so indoors that means a south- or west-facing window or a grow light. It can also spend summer outdoors once nights stay above about 60°F (15°C), as long as you bring it back in before they drop below that.
Why is my ficus bonsai losing leaves after I brought it inside?
A ficus adjusts its leaves to the light it is in, so a move to a darker room, or into a room where the heating has just come on, often makes it drop a batch of leaves over one to three weeks. Keep it in the brightest spot you have, away from radiators and cold draughts, keep watering by feel, and don't move it again. It usually pushes new leaves suited to the new spot within a few weeks.
Remember what you changed, and when.
A photo timeline for every tree, one-tap care logs, and reminders on your Home Screen and Apple Watch set to your own intervals.
Download Bonsai on the App Store →Related: How to Care for a Bonsai Tree, Bonsai Dropping Leaves and Bonsai Winter Care. Care intervals here are working rules for typical indoor conditions; if a valuable tree is declining fast, a local bonsai club or nursery can look at the actual roots. Questions or corrections: support@elevenapril.com.
