Why is my fiddle-leaf fig dropping leaves?

Ficus lyrata has a reputation for being dramatic, and it has earned it, but the drama follows rules. Every ficus responds to stress the same way: it sheds leaves. That is the whole vocabulary. So the question is never really "why is it dropping leaves," it is "what changed," and the pattern of which leaves fall is how you find out.

The most likely cause: something changed, and it is protesting

Ficus species are famously sensitive to changes in light, temperature, humidity, and position. Coming home from the nursery is a change. Being turned around is a change. A cold snap, a new AC setting, or getting moved for a party is a change. When conditions shift, the plant sheds leaves it can no longer support in the new situation, and it does that over one to three weeks, which is long enough that people usually blame whatever they did on day ten.

In this region I find the culprit is often the air conditioning rather than the plant's position in the room. A fiddle-leaf fig standing in the path of a ceiling vent gets a constant column of cold, dry, moving air on one side. That side browns, curls, and drops, and moving the plant four feet solves what a year of fertilizer could not. Walk over and hold your hand where the plant is, with the AC running, before you change anything else.

The single most effective thing you can do for a protesting fiddle-leaf fig is genuinely counterintuitive: pick the brightest reasonable spot and then leave it completely alone for a month. Most of the ones I see declining have been moved three or four times by an owner trying to help, and each move restarts the clock.

The other causes, ranked

• Not enough light. The most common chronic cause, as opposed to the most common sudden one. Lower leaves yellow and drop one at a time, new leaves come in small, and the plant leans. Ficus lyrata wants the brightest indirect light in the house and tolerates some direct morning sun. Our deep roof overhangs and screened lanais make interior rooms much dimmer than they feel.
• Roots too wet. The serious one. Big leaves on a small root system means these plants dislike sitting in saturated soil, and a decorative cachepot with no drainage is a frequent accomplice. Dark spreading spots on leaves plus soggy soil plus a musty smell is the pattern; see root rot.
• Roots too dry, repeatedly. Less common but real, especially with a big plant in a small pot. Leaves go limp, edges crisp, and whole leaves drop after the plant dries out hard. Water thoroughly until it drains, then let the top two inches dry.
• Dry AC air and mineral salt buildup. Produces crispy brown edges rather than whole-leaf drop, but stressed plants drop stressed leaves. Flush the pot with plain water every couple of months to move the accumulated mineral salts from tap water and fertilizer out.
• Pests. Check the undersides. Fine webbing and stippling means spider mites, which love the dry air of a conditioned house; cottony lint in the leaf axils means mealybugs.

How to tell them apart

• Pick up a dropped leaf. Green and healthy-looking? Shock or cold draft. Yellow all over? Light or age. Brown spreading blotches? Root damage. Crispy only at the edges? Air and salts.
• Where on the plant. Bottom-up and gradual is the light and age story. All over at once is shock. One side only points at a vent, a door, or a window.
• Check the soil and the trunk. Wet soil days after watering plus a trunk that is soft or dark near the soil line means you have root rot and should act now.
• Look for buds. Small tight new growth at the top means the plant is still investing in itself and the prognosis is good, whatever it is dropping.

What to do this week

1. Find the brightest spot in the house that is out of the AC airflow, and move it there once.
2. Then stop moving it. Give it a full month in that spot before you judge.
3. Water only when the top two inches are dry, thoroughly, until water runs out the bottom; empty the saucer.
4. Take it out of any cachepot that has no drainage hole.
5. Wipe the leaves with a damp cloth. Dust on those big leaves genuinely reduces the light they capture, and it is also how you spot mites early.
6. Skip the fertilizer until it is holding steady and pushing new growth.

When to call me

A fiddle-leaf fig is usually the most expensive plant in the room, which changes the math on getting a real answer. Call when the trunk is soft, when the plant has lost half its leaves, or when it has been declining steadily for more than a month despite a change of spot. A health diagnosis visit checks the roots, the light meter reading in that actual room, and the airflow, and tells you honestly whether the plant is recoverable before you spend more on it. If it is not, I will say so, and we will talk about what belongs in that corner instead.