Streptosolen - Solanaceae - Cultivation, care and flowering of Streptosolen plants



There Streptosolen is a delightful indoor and outdoor plant that forms an orange-yellow stain throughout the summer thanks to its particularly showy and numerous flowers.






: Angiosperms


: Eudicotyledons


: Asteris











: see the paragraph on "Main species"


The genre Streptosolen belonging to the large family ofSolanaceae (we have to find numerous genera, among which the most famous peperoncino) includes only one species, the Streptosolen jamesonii native to Colombia, where the climate remains mild throughout the year.

It is an evergreen shrubby plant that can reach two meters in height, characterized by oval, dark green leaves, arranged alternately along the stems and up to 5 cm long.

The flowers gathered in apical corymb inflorescences are pedunculated, characterized by a calyx and a tubular corolla that opens forming five lobes in the terminal part. They are orange-yellow in color and 2 cm wide.The flowering is very long as it begins in late spring and continues throughout the summer and if the climate is particularly mild, even in autumn.


The Streptosolen they are easy to cultivate plants that do not require particular crop care. In areas with a mild climate they can be grown without problems in full ground, otherwise it is better to keep them in pots to arrange them in sheltered areas during the winter period, in fact if the minimum temperatures drop below 7 ° C, the plant begins to suffer.

They are plants that require a lot of light but not the direct rays of the sun except in the morning or in the evening but never in the hottest hours of the day.

Since the stems of the Streptosolen they are quite thin, it is advisable to offer them a brace to lean on for growth in height or to ensure them a pergola as they grow.


It is a plant that requires regular watering during the spring-summer period, taking care to let the soil dry on the surface between one watering and another. Irrigation, on the other hand, is significantly reduced in the autumn-winter period.


There Streptosolen it should be repotted using a good soil consisting of garden soil, peat and coarse sand to favor the drainage of the watering water as it does not tolerate water stagnation.

At the time of repotting it is advisable to place a stake in the ground to which it can be planted as it grows.


There Streptosolen fertilize once a month from spring and all summer using a good fertilizer diluted in the watering water and halving the doses compared to what is reported in the fertilizer package.

It is advisable to use a fertilizer that in addition to having macroelements such as nitrogen (N), phosphorus (P), potassium (K) also contains the so-called microelements, that is to say those compounds that the plant needs in minimal quantities (but hapur always needed) such as magnesium (Mg), iron (Fe), manganese (Mn), copper (Cu), zinc (Zn), boron (B), molybdenum (Mo), all important for a correct and balanced plant growth.


Immediately after flowering, dry branches must be eliminated up to 2/3 of their total length to stimulate the production of new flowering side branches and prevent the plant from developing too high at the expense of its density.


There Streptosolen jamesoniiit blooms starting from late spring and throughout the summer and if the climate is particularly mild, even in autumn.


There Streptosolen multiplies by cutting.

Woody seed cuttings about 10 cm long at the beginning of spring are taken from the non-flowering lateral shoots. The cuttings must be cut immediately under the node and the cut must be done obliquely as this allows for a greater surface for rooting and avoids the accumulation of water on this surface.

Use a razor blade or a sharp knife to avoid fraying of the tissues and take care that the tool you use for cutting is clean and disinfected (preferably with the flame) to avoid infecting the tissues. dips the cut part in a rhizogenic powder to favor the rooting of the cuttings. At that point they settle in a compost made of peat and coarse sand in equal parts by making holes with a pencil, as many as there are cuttings to be arranged, taking care to gently compact the soil.

The box or pot is placed in the shade and at a temperature of around 18-21 ° C, taking care to keep the soil always slightly moist, watering the rooting cuttings without wetting them with water at room temperature. , it means that the cutting has rooted, at which point the pot is placed in a brighter area, at the same temperature and expects the cuttings to become stronger. Once they are large enough, each cutting is transplanted into individual pots and treated like adult plants.

Remember to trim young plants to favor the emission of lateral shoots.


Presence of small mobile insects on the plant

If you notice small light-colored insects you are almost certainly in the presence of aphids or as they are commonly called lice.

Remedies: the plant must be treated with specific pesticides readily available from a good nurseryman. These are generally systemic products, i.e. they enter the lymphatic circulation of the plant and are therefore absorbed by the aphids during feeding.

Leaves that begin to turn yellow and appear mottled with yellow and brown

If the leaves show this symptom and after these manifestations they curl up and take on an almost dusty appearance and fall, it is likely that an attack of red spider mite, a very annoying mite, is in progress. Observing carefully you can also notice some thin cobwebs especially on the underside of the leaves.

Remedies: increase the humidity around the plant as a dry environment favors their proliferation. If the infestation is particularly severe, specific insecticides must be used. If the plant is not particularly large, you can also try cleaning the leaves to mechanically eliminate the pest using a wet, soapy cotton ball. After that the plant must be rinsed very well to remove all the soap.

Brown spots on the leaves

Brown spots on the leaves especially on the underside could mean that you are in the presence of cochineals, brown cochineal or mealy cochineal. To be sure, it is recommended to make use of a magnifying glass and observe them. Compare them with the photos on the side, they are characteristic, you can't go wrong. Also if you try to remove them with a fingernail, they come off easily.

Remedies: they can be eliminated using a cotton swab dipped in alcohol or if the plant is very large and potted, it can be washed with water and neutral soap by rubbing gently with a sponge to remove the parasites, after which the plant should be rinsed to eliminate all the soap. For larger plants planted outdoors you can use a specific pesticide available from a good nurseryman.


The name Streptosolen dcame from the Greek streptos «twisted "esolen «Tube» due to the shape of the corolla which looks like a twisted tube.

Video: Solanum tuberosum - Potato flowers - Kartöflublóm - Jarðepli - Náttskuggaætt

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