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If you've recently purchased a Phyllanthus, the chances are it's nothing but the caudex itself. You may begin to ask yourself questions like, "what soil and pot do I need?", or "how deep do I transplant it into the soil?". This section is all about which compost, pot size and potting tips to get yours to thriving in no time!
The most fundamental aspect of a happy Phyllanthus mirabilis is to ace its soil requirements. Because of its swollen stem, you won't need a highly water-retentive potting mix and instead should opt for a grit or sand-based soil. We'd recommend a 'Cactus & Succulent' labelled potting mix, as it has a good blend of compost, perlite (to help airflow), grit and sand. You can even add some additional small stones or pebbles into the potting mix to increase the drainage further.
Chose between using a decorative pot with drainage holes (like terracotta, ceramic, etc.) or through a plastic nursery pot with an additional decorative pot. We'd recommend using terracotta as it'll absorb moisture and provide a more aesthetically-pleasing contrast to the woody caudex and foliage, but others are just as good. Remember, never place your plant in a pot with no drainage holes as this will be a one-way ticket to plant death.
In terms of the size, make sure there is a gap between the pot's edge and the caudex's base of around a few inches. Although it's better to keep the roots snug, as supposed to over-potting them, you may not have enough room to pour soil in between the gaps, for example. The image below illustrates this well.
The depth of the caudex in relation to the soil line is another major piece to the puzzle. We'd recommend placing the bottom third into the soil, with the rest sitting proudly above the potting mix. It's unadvised to pot yours too deeply, as the risk of basal rot will dramatically increase, the further into the soil it goes.
A location with a splash of morning or evening sun is the ideal setting for this species, as too dark scenes will heighten the chance of weakened health and over-watering related issues. Although direct sunlight is beneficial for a Phyllanthus, avoid scorching the leaves with too intense rays as this will quickly lead to a murky green appearance, especially in the summer.
In terms of the ideal location around the house, as long as the desired location is above 15ºC (59ºF) and is on a north, east or west-facing windowsill, it'll be accepted. Do not situate it in a dark location metres away from a light source, as this will only increase the chance of over-watering. Those kept around 30cm (1ft) from a grow light is also acceptable, as this will provide a more reliable environment and reduce the risk of sun-scorch.
Allow the top half of the soil to dry out in between waters during blooms in autumn or winter. Once the pot feels light when lifted, compared to when you last watered it, this is the best time to rehydrate. Once the leaves begin to yellow or drop in succession, reduce the frequency of irrigations further to replicate its dormancy from late winter onwards. As long as the caudex never sits in soggy or standing water unnecessarily, it can be happy for years to come. It's always better to under-water a Phyllanthus than over-do it, as they naturally grow in semi-dry conditions of Laos, Myanmar & Thailand. Under-watering symptoms include curled or crispy leaves, wilted foliage, yellowing leaves and stunted growth. Over-watering symptoms include yellowing or browning leaves, stunted growth, wilting and a rotten base. Avoid the soil becoming overly saturated due to the species' susceptibility to root rot and other soilborne diseases. If this has happened to your specimen, increase the intensity light somewhat with fewer irrigations - a fully softened over base most likely will spell the end of its life. Over-watering is commonly caused by too little light or heat or a lack of drying soil in between irrigations. We would take the plant out of its pot and have a quick scan of its root systems, too. Click here to learn more about root rot.
Create a humidity tray to provide a moist and stable environment for your plant. If the surrounding saturation is too low or the heat too high, its leaf-tips may start to excessively brown over and curl, especially in direct sunlight. Gently mist the foliage from time to time to hydrate the leaves and keep the dust levels down. A humidity level of 60% or higher is acceptable for Phyllanthus mirabilis.
Regular fertilisation isn't always needed for this species, as overly fertile soil may cause chemical salts to build-up over time. We'd recommend fertilising your specimen every four waters in the summer and autumn period, while reducing this to every six waters thereafter. We recommend using either a 'Cactus' or 'Houseplant' labelled fertiliser for best results.
If all of the leaves yellow and drop off during the winter, don't be alarmed. Reduce watering and fertilisation dramatically to ease the plant into its dormancy. Give the specimen one final water with fertiliser before allowing all of the soil to dry out, until the new growth appears in the late spring.
A good dormancy at the end of its growing period will allow the caudex to regain its strength for the following season. There's no need to cut the leaves off, but removing them won't be a detriment either. We'd recommend leaving the specimen as it is, allowing the leaves to drop naturally. Here are the key tips for keeping a Phyllanthus for years to come, and how to prepare for its dormancy from winter onwards.
N. B. - In some cases, the specimen won't drop its leaves an will continue to appear like it's growing. If this happens to yours during the winter and spring, reduce watering to every few weeks while still keeping it in the same location. Allow the plant to take control of what it wants and go with the flow!
Phyllanthus mirabilis is considered 'deciduous', meaning that it'll drop some (or all) of its leaves at some point of the year. This is most likely to occur in the winter and summer, while the plant serves its dormant period.
Your plant will do either of two things - keep its leaves or begin to shed them until it becomes 'naked'. This is a totally natural process of its life, which will help it flourish in the following season (late spring onwards). If the leaves begin to yellow and crisp over, this could be the sign of the change in its appearance. Once all of its leaves are gone, maintain a warm, dry location with little to no watering during this period. You can store the plant in a darker area until there are new signs of life, or keep it in the original location. Once spring comes to an end, increase the ambient temperature (or relocate to a sunnier area) to stimulate new growth in its roots and node (where the stem will regrow, at the caudex's top). Give the plant a good thorough water, diluted with a 'Houseplant' labelled fertiliser, and wait for the new growth. This could take either a matter of weeks or even months. Give the plant time and always keep the soil dry until the growth emerges.
We wouldn't. It's better to allow the plant to rest during the dormancy period, as disturbed roots could cause poor future growth rates and weakened health. Only if you're worried about root rot, should you remove the plant from its pot. Otherwise, leave it alone!
Scroll down to 'Repotting' to learn more about transplanting a mature, rooted specimen.
Yellowing foliage, accompanied by a sudden loss of leaves, is most likely caused by the specimen entering its dormancy period. Scroll up to 'Dormancy Care' to learn more about this phenomenon.
Yellowed leaf-areas with browned halos can be caused by an array of simultaneous issues, but equally could be a sign of it entering the dormancy period. If the base of the plant still feels plump and you know for certain that you haven't over-watered it, scroll up to 'Dormancy Care' to learn more. If, however, your plant is showing signs of probable illness, carry on reading.
Firstly, the location may be too dark, with its compost staying too saturated in-between waters; if mould is growing across the soil, this is usually a bad sign. As mentioned above, partial exposure to the warmth of the sunlight will stimulate better growth, meaning that shaded areas must be avoided at all costs. Further, you're potentially using too cold water or tap water that hasn't been allowed to sit for 24hrs. This period of rest will not only bunk-up its temperature, but the harsh chemicals used to preserve water hygiene (fluoride & chloride) will begin to settle after a few hours. If possible, use fresh bottled water from a shop or supermarket to prevent chemical burns. The final culprit might be lack of fertilisation, with infrequent feeds being paramount for long-lasting, healthy specimens. If the specimen hasn't been nourished in over two months, it'll begin to show signs of nutrient deficiencies seen in this article.
If this common problem has occurred with your specimen, remove the affected leaves (not sections on the leaf) and improve the growing conditions considerably. Fertilise regularly with lukewarm water and be sure to allow the top third to dry out in between hydrations. Its new growth should be problem-free, but if you'd like to speak to ukhouseplants for more advice, don't be afraid to book a 1-to-1 call with our friendly author, Joe Bagley!
Over-watering is the biggest issue with Phyllanthus mirabilis. Avoid keeping the compost wet for extended periods, especially in the dormant period of winter-spring. Allow the top half of the soil to become dry in between waters, and always remember to use tepid water to avert shocking the tender root systems. Typical signs of over-watering include yellowed leaves, stunted or wilted growth and a softened base. Click here if you are worried about root rot.
Too little light could cause a lack of leaf-movement or new growth. Its leaves will begin to stay partially or fully opened, still sporting a healthy green appearance. If you're scared that the location is too dark, we would recommend increasing the light slightly. Phyllanthus do best in bright locations that offer a period of morning or evening sunlight, especially in the height of winter (if your specimen has leaves still). Give the specimen a good feed when you next come to water it, to increase the overall health levels within the plant.
Too much sunlight will lead to sun-scorch, with typical signs including browning or crispy leaves, dry leaf-edges, curled leaves or little growth. Although too low light will cause over-watering issues, too much sunlight will also be a detriment in the likes of dehydration. A location that offers a little to no direct sunlight will bring the optimum growth for the specimen.
Phyllanthus mirabilis was first described by Johannes Müller Argoviensis in the mid 19th-century. He placed it in the already-constructed genus of Phyllanthus, which can be translated from Latin to mean 'leaf-flowers'. This is in reference to the flowers that are housed on the phyllanthoid-like foliage. The specific epithet, mirabilis, translates to 'wonderful' or 'remarkable', referring to its ability to close the foliage at night. The species has natural distributions across Myanmar, Laos & Thailand.
15° - 28°C (59° - 82°F)
H1a (Hardiness Zone 13) - Must be grown indoors or under glass all year round. Never allow temperatures to dip below 15℃ (59℉) or permanent damage may occur in the likes of flower loss, stunted growth and blackened/yellowed leaves.
Caudex - Up to 24cm in diameter.
Branches - Up to 50cm in length & 15cm in width.
Individual Leaves - 8cm in height & 4cm in width.
Maturity can take over twenty years in some cases, with the overall height surpassing 1m (when it supports leaves).
Remove yellowed or dying leaves and plant debris to encourage better growth and improve the all-round appearance. Pruning must be done with clean scissors or pruners to reduce the chance of bacterial and fungal diseases; remember to make clean incisions as too much damage can shock the plant.
Scroll up to 'Dormancy Care' to learn more about pruning over the winter-spring period.
Seeds (Moderate to Difficult) - Soak the seeds in lukewarm water for around 24hrs in a dark location, preferably on top of an operating radiator. The best soil to use is a 'Cactus & Succulent' labelled potting mix; however, multipurpose compost with added perlite and sand is as good. Set the seeds around 0.5cm deep (0.2 inches), resisting the temptation to compact it. Maintain evenly moist soil and allow the excess water to freely drain from the pot's base to prevent water-logged conditions. You can sprinkle a fine layer of Vermiculite onto the soil's surface to maintain better moisture levels - key for quicker germination rates. The ideal location for successful growth is in a bright, indirect setting with temperatures above 18℃ (64℉) with bottom-heat. Keep the pot in a transparent bag to provide a stable level of humidity, along with longer-lasting soil moisture. Germination may take up to five months, so don't discard any unsuccessful seeds until this threshold has been surpassed. Remove the bag once the seedlings produce their second leaf and then split them into their own 5cm (2 inch) pots.
There isn't much information about its flowers in reputable sites or books, so describing its blooms is near impossible at this stage. We'll regularly search for further information on this for you.
Once your specimen has been happily growing in its original potting mix for around three years, it'll be time for a transplant. We'd recommend repotting the plant in the early summer, using the next sized pot with drainage holes and a 'Cactus & Succulent' labelled potting mix.
Step-by-Step Guide on Repotting a Mature Specimen
Book a 1-to-1 video call with Joe Bagley if you'd like a personal guide to repotting your houseplant. This will include recommending the right branded-compost and pot size, followed by a live video call whilst you transplant the specimen for step-by-step guidance and answer any further questions!
Keep an eye out for spider mites, thrips, whitefly & mealybugs. Common diseases with Phyllanthus are root or basal rot, powdery mildew, leaf-spot disease and botrytis petal blight. Most diseases are caused by excess moisture in the soil or the foliage; maintain dry leaves and always avoid water-logging for best results.
This plant is classified as poisonous. If parts of the plants are eaten, vomiting, nausea and a loss of appetite could occur. Consumption of large quantities must be dealt with quickly; acquire medical assistance for further information.
This species is sold rarely on internet stores and almost never in physical stores.
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