Yellow leaves on a stephanotis almost always mean the roots, not the leaves. Three causes account for nearly every case: watering too often, water that is too hard, and a room that is too cold or too draughty. Each leaves a slightly different signature, and reading it correctly saves the plant – because by the time whole leaves are yellow, the cause has usually been at work for weeks.
Where the yellow appears, and in what order, tells you which of the causes you are dealing with.
| What you see | Most likely cause | What to do |
| Lower leaves yellow, then fall, compost stays wet | Watering too often. The commonest cause by far | Let the compost dry to 2 in (5 cm) down before watering again |
| Yellow between the veins, veins staying green | Lime from hard tap water blocking iron uptake | Switch to rainwater; a sequestered iron feed will green it up |
| Whole leaves yellow at once, after a cold spell | Cold, or a draught from a door or window | Move it above 55°F (13°C), away from any draught |
| Yellowing and the leaves are limp | Root rot – the roots have died and cannot drink | Unpot and inspect. Firm pale roots can be saved |
| Leaf edges brown and dry, air very dry | Dry air, typically over a radiator | Raise the humidity around the plant |
| Pale mottling with a silvery sheen | Red spider mite or thrips | Look under the leaves before treating |
| Yellowing with sticky leaves | Aphids or scale insects excreting honeydew | Deal with the insect; the yellowing follows it |
| Uniform pale green, growth slow | Underfed, or root-bound after years in the same pot | Feed in growth, and repot it |
Stephanotis wants to be evenly moist in growth and almost dry in winter, and most plants are lost by ignoring the second half of that sentence.
If the compost is soggy and the leaves are limp as well as yellow, you are past overwatering and into root rot. Unpot the plant, cut away any brown soft root, and repot into fresh free-draining compost.
Four turn up on stephanotis, and each has a signature you can read before you spot the insect itself.
A stephanotis that grows vigorously and never blooms is almost always a plant that has been treated too kindly in winter.
Buds that form, then yellow and fall before opening, are the plant’s response to any abrupt change: being moved or turned, a draught, a spell of drought, or a sudden shift in temperature. Nothing is wrong with it. Settle it in one bright spot, water evenly, and leave it alone until the flowers open.
Before anything else, tip the plant out of its pot and look at the roots. White and firm means the problem is above ground – light, cold, air, hard water. Brown and soft means you have been watering too often, and no amount of feeding or misting will help. Two minutes settle it.
Most often because it is being watered too often: the lower leaves yellow and drop while the compost stays wet. Two other causes are common – hard tap water, which blocks iron uptake and yellows the blade between green veins, and cold or draughts, which yellow whole leaves within days. Check the compost 2 in (5 cm) down before doing anything.
Almost always overwatering. A stephanotis resting at 55 to 59°F (13 to 15°C) may need water only every two or three weeks; watered as though it were still growing, it yellows and drops its leaves. Cold draughts from a window and dry air from a radiator add to it.
Yes, if you can. It is genuinely lime-sensitive: on hard tap water the leaf blade yellows while the veins stay green, a sign the roots can no longer take up iron. Rainwater prevents it, and a sequestered iron feed will correct an existing case within a few weeks.
Because it has not had a cool dry winter rest. Flower buds are set between late autumn and late winter at 55 to 59°F (13 to 15°C) with very little water. A plant kept warm and watered all year grows well and never blooms. Too little light, and a feed too rich in nitrogen, add to the problem.
Because something changed. Stephanotis drops its buds after being moved or even turned, after a draught, after drying out, or after a sudden change of temperature. Choose one bright spot, water evenly, and do not touch it until the flowers open.
Thrips. They rasp the cells and air replaces the sap, which is what produces the silvery sheen; the tiny black specks alongside are their droppings. Treat early, and check the leaf undersides – thrips also carry viruses, which is the real reason not to leave them.
Almost certainly Aphis nerii, the oleander aphid, which specialises in this plant family. Dislodge them with a jet of lukewarm water or a soapy spray, and check again after a week: they build up again quickly on soft new growth.
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What is the big fruit like on my stephanotis? Looks like a big mango fruit hanging from the vine.
It’s exactly as you think – a stephanotis seed pod! Inside are many seeds with a fluffy tail to fly away. When it dries out, seeds will spread and germinate immediately if they meet moist soil. Learn more about it here.
My Stephenotis has large marbling on it leaves.
Hi Pamela, it seems it might be some type of fungus. These usually start attacking when the plant is weak, for instance when it’s particularly hot or when it lacks water or nutrients.