At a glance
Stephanotis floribunda – sold in the UK as Madagascar jasmine – produces clusters of waxy white tubular flowers with one of the most beautiful scents of any houseplant. A well-grown specimen in full flower in June or July is exceptional. The plant will repeat this performance reliably year after year if two conditions are met: a cool winter rest to trigger bud formation, and complete stability once buds appear. Fail on either and the results are either no flowers at all, or buds that drop before they open.
The winter rest
The single most important fact about growing stephanotis in the UK: the plant needs a cool rest period of 10 to 13 degrees Celsius from October through to February to form the flower buds that will open the following spring and summer. Without this cool period, the plant simply does not produce flower buds, regardless of how well it is fed, how much light it receives, or how carefully it is watered. A stephanotis kept in a warm centrally heated living room year-round will produce lush green foliage and nothing else.
An unheated conservatory that does not drop below 7 degrees on the coldest nights is ideal. A spare bedroom with the radiator turned off, a bright frost-free porch, or a cool hallway all work. The plant still needs reasonable light during the rest period. Reduce watering significantly but do not allow the compost to dry out completely. The minimum temperature is 7 degrees Celsius – below this the plant suffers cold damage and can drop leaves. On the coldest nights in a marginal position, bring the plant indoors temporarily.
In spring, as daylight lengthens and temperatures rise naturally, the buds that set through the cool winter will begin to swell and develop. Move the plant carefully to its summer position, increase watering to match resumed growth, and begin a fortnightly feeding programme with a high-potassium fertiliser.
New plants and first flowering
New stephanotis plants purchased from a garden centre may flower in the first summer after purchase if they have already been through a proper rest period in nursery conditions. However, some take a full season or two to settle into reliable annual flowering after the disruption of being propagated, grown on, and moved through retail. This is normal. Do not give up on a non-flowering plant too quickly. Give it a proper cool winter rest at 10 to 13 degrees and assess at the end of the second season. Once the rest pattern is established, flowering is reliable year after year.
Bud drop – never move when in bud
When flower buds are forming or developing – which can begin as early as March and continues through to when the flowers actually open – the plant is acutely sensitive to disturbance. Moving the pot, turning it, changing the light direction, allowing a cold draught to reach it, or subjecting it to a significant temperature fluctuation causes buds to drop before they open. The entire cluster can fall within 24 to 48 hours of the disturbance. There is no remedy. The dropped buds will not reattach.
Identify the plant’s permanent summer position before the first buds appear – ideally in February while the plant is still in its cool rest position – and commit to keeping it there, facing exactly that direction, until all flowers are past their peak. The risk period is longer than most growers expect. Both underwatering and overwatering during this period also cause bud drop, as does low humidity below 40 percent relative humidity. The plant is more sensitive at this stage than at any other point in the year.
Light
Stephanotis needs bright light with some gentle direct sun. Morning or late afternoon direct sun is ideal. A south or east-facing windowsill is the best position. West-facing works but the plant may flower somewhat less freely. North-facing rooms do not provide enough light for reliable flowering. During the winter rest period, maintain good light – the plant is forming buds and adequate light supports this process. In midsummer, protect from the most intense midday sun through south-facing glass – light net curtain diffusion is sufficient.
Support and training
Stephanotis is a climber that produces long flexible stems. These must be supported and trained from early in the plant’s life. A wire hoop in the pot is suitable for smaller plants. Larger specimens need a more substantial framework – a trellis fixed to the wall behind the pot, multiple canes arranged into a fan or tower, or a larger climbing frame. The stems twine around supports rather than using tendrils or sticky pads, so new growth must be manually guided around the frame as it extends. Do this while stems are young and flexible – mature hardened stems cannot be bent without snapping. Wind new growth loosely; tight training creates constriction points that restrict sap flow as stems thicken.
Be careful not to disturb or flex stems that are carrying developing buds. When training new growth in spring, work away from any bud-bearing sections.
Watering
Keep the compost evenly moist during the growing season from March to September. Check when the top centimetre of compost has dried out and water thoroughly until water drains freely from the base. Empty the saucer within half an hour. Always use tepid or room-temperature water – cold water shocks the root system and can trigger leaf yellowing or bud drop, particularly during the sensitive bud development period.
During the winter rest, reduce watering substantially. Cool temperatures and low light dramatically reduce the rate at which compost dries out, and overwatering in winter is one of the most common routes to root rot. Allow the top half of the compost to dry between waterings. During the bud development and flowering period in spring and early summer, check the compost more frequently than usual – every day if buds are showing – and maintain even moisture. Both underwatering and overwatering during this period cause bud drop. Hard tap water used repeatedly deposits mineral salts in the compost; flush the compost with several pot-volumes of water twice a year, or use collected rainwater.
Humidity
Stephanotis performs better and with fewer pest problems in higher humidity. Mist the foliage with tepid water every few days during the growing season – do not mist when in flower as water on the open flowers causes brown spotting. A pebble tray raises local humidity continuously through evaporation. A humid kitchen or bathroom with adequate light is often an ideal permanent position. Below 40 percent relative humidity, buds may drop before fully opening even without any other disturbance. Spider mite infestations are significantly more likely in dry conditions, so maintaining adequate humidity reduces pest risk alongside its direct benefit to the plant.
Feeding
Feed fortnightly from March through to September with a high-potassium fertiliser. A tomato feed – widely available in the UK, inexpensive, and specifically formulated to promote flowering through elevated potassium – is ideal. Apply at the full recommended rate every two weeks through the growing season. High-nitrogen fertilisers promote leafy growth at the expense of flowering and should be avoided. In September switch to a balanced feed for two to three weeks before stopping altogether in October. Do not feed at all through the winter rest period.
Seasonal care
Repotting
Repot in spring every two to three years, or when the plant is clearly pot-bound: roots growing through drainage holes, compost drying within a day or two of watering, or visible root compression when the plant is removed from its pot. The stephanotis tolerates and performs better when slightly root-bound – an oversized pot holds excess moisture and reduces the plant’s inclination to flower. Move up one pot size at a time. Use a free-draining compost – multipurpose with 20 to 25 percent perlite is appropriate. Do not repot once buds are visible. Complete spring repotting before the first buds appear.
Pruning and spent flowers
Prune lightly after flowering in late summer or early autumn before moving to the cool winter position. Remove dead, damaged, crossing or overcrowded stems. The stephanotis flowers on new growth produced in the current season, so pruning after flowering allows time for new shoots to develop before the following spring. Avoid heavy pruning – a plant cut back hard can take two or more seasons to return to its previous flowering capacity. Remove about a quarter of the oldest stems each year rather than cutting everything back at once. Never prune in spring when buds may be present. Always wear gloves when pruning as the sap is an irritant.
Remove spent flower clusters by cutting the short stem carrying the entire cluster back to the main stem. With consistent feeding and stable conditions, some plants produce a second smaller flush of flowers in late summer. This is more likely when the first flush is deadheaded promptly and feeding is maintained.
Propagation
Propagate from semi-ripe stem cuttings taken from April to June. Take a cutting of around 10 centimetres with two or three pairs of leaves. Remove the lower pair of leaves and insert into moist cutting compost or a 50:50 mix of perlite and multipurpose compost. Cover with a plastic bag or place in a heated propagation unit. The rooting temperature should ideally be 18 to 21 degrees Celsius minimum – a heated propagation mat provides this reliably. Rooting takes four to eight weeks. Success rates are variable even with ideal technique. Always wear gloves when taking cuttings as the sap is an irritant.
Pests
Sap and safety
The milky sap produced when any part of the plant is cut or damaged is a contact irritant. Eye contact requires thorough rinsing for at least fifteen minutes. The plant’s toxicity if ingested is disputed – some sources classify it as mildly toxic, others report it as safe. As a precaution keep the plant away from pets and young children who might chew on it. Always wear gloves when pruning or taking cuttings. The sap stains – work over newspaper or a washable surface.
Yellowing leaves
Some yellowing of the oldest leaves in autumn as the plant prepares for its rest period is completely normal and does not indicate a problem.
Buying and the first season
Stephanotis is most commonly available in the UK from late spring through to late summer, often sold in flower on a wire hoop. When buying, choose a plant with a good number of remaining closed buds rather than one where most flowers are already open – this gives a longer display. Check leaf axils and growing tips for white mealybug deposits before purchasing.
Transport carefully – cold draughts in the car and jostling can trigger bud drop. Take the plant directly to its intended permanent position. Do not repot immediately. Water once if the compost is dry. Leave it completely undisturbed for several weeks. Initial bud drop in the first week or two after purchase is the plant processing the stress of multiple transitions from nursery to retail to home – if conditions are right and it is left alone, the drop will stop and the remaining buds will open normally.
After the first flowering season, plan for the cool winter rest in October. This single step – providing a proper cool period at 10 to 13 degrees Celsius – is what converts a plant that flowers once into one that flowers reliably every year for the life of the plant.
Cut spent flowers at the base of the cluster, not at the individual flower. Remove the entire spent flower cluster by cutting the short stem that carries the whole group back to the main stem. Leaving spent clusters does not produce a second flush – remove them to redirect energy into the next season’s bud development.
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