Roridula - Carnivorous plant


Roridula are carnivorous plants that capture their prey by means ofVISCOUS SECRETIONS that bog down the prey. In some of them the secretion is constant while in others it occurs only in the presence of the prey.

The roridula belongs to the Roridulaceae family and is the only genus present in this family and they are native to the poor soils of south-east Africa located in areas characterized by hot and dry summers and cold and very rainy winters.

There are only two species: the Roridula dentata which becomes a very imposing and branched bush and the Roridula gorgonias which, on the other hand, remains smaller and less branched.

It is considered a semi-carnivorous plant because it does not digest its prey but absorbs its excrements.

They have leaves with hairs that sew up very sticky resinous substances that look like real "quick-setting" glues that remain active for a long time, even when the leaves are now dry.

Rodidula cannot be considered real carnivorous plants as they do not have the ability to digest the prey they capture. In fact, it is thanks to a mutualistic symbiosis with the "assassin bugs" ("assassin insects" of the Reduvidi family) that feed on the insects captured by the plant and then the roridula feeds on the excrements of these insects which have a high content of nitrogen.

Cultivation of this plant is not easy considering its places of origin. In fact, home cultivation is problematic. Even more so in the greenhouse as they require high temperatures and a fairly dry environment, which is not easy to reproduce.

It is in fact a plant that grows all year round although, considering that in its places of origin growth occurs during the rainy period, it obviously maintains this characteristics and growth is more active during the spring period. There flowering it occurs from the middle of winter until the beginning of spring.

Whereas they are plants that live in land sandy, the cultivation substrate can be made up of 60% of fine sand and the rest of peat. They like direct sun and low ambient humidity; this means that the air circulation must be excellent to ensure the dry environment they need.

Now for fertilizations of the roridula it is not necessary that we go hunting for insects to provide the plant with its nourishment. We assume that in nature the plant adopts these strategies as it has no other nourishment available. Being entrusted to our care, we will provide it with the chemical elements necessary for its growth. In any case, keep in mind that the plant does not like fertilizations so you must use very low concentrations (1/4 of the doses indicated in the package) and use fertilizers that have a high nitrogen content and very low in the other elements.

Temperatures cultivation must not drop below 5 ° C and the soil must always be kept moderately humid and water that is very poor in mineral elements (rain or distilled water) is used.

For the repotting roridula are plants that need to be grown in large pots and with a lot of soil available as they grow quite quickly. If we need to change the pot, it must be done with great care as the roots are very thin and fragile.

As far as the multiplication of the roridula can occur either by seed or by cutting. Multiplication by cuttings is very difficult to do as it is difficult to find the right degree of humidity to prevent the cuttings from rotting. Comparatively simpler is multiplication by seed. The roridula are self-pollinating so either we leave it to mother nature or we scratch the anther and sprinkle the pollen collected on the pistil. Once pollinated, capsules will form which take several months to open and contain only three seeds.

Roridula spp. Atlas of Potted Plants - Carnivorous Plants

First name: Roridula spp.
Kind: Roridula
Family: Roridulaceae

Roridula (L. 1764) is the only genus belonging to the Roridulaceae family and is present in southwestern South Africa. The genus includes two species: the Roridula dentata which becomes a very imposing and branched bush and the Roridula gorgonias which also grows in a bushy form but much less tall and branched than the other species and the leaves have a darker green color.
Although these plants possess many of the adaptations of a carnivorous plant, such as the presence of sticky hairs for catching insects, they do not directly digest their prey. The plant, on the other hand, has mutualistic relations with the hemiptera of the genus Pameridea, which feed on the insects trapped by the plant. This then absorbs the nutrients excreted by its symbionts.

Roridula, carnivorous plant

There Roridula is a plant native to the African continent and belonging to the family of Roridulaceae. It is inserted between carnivorous plants, even if it does not eat its prey, but captures them thanks to the resinous substances present on it leaves. It is characterized by drums more or less branched, forming dense green or reddish bushes flowers they are made up of five pink petals and appear during the winter season or at the beginning of spring.

there Roridula it is not an easy to grow plant, as it is difficult to recreate the climatic conditions of the places of origin in the home. In fact, this plant prefers very high temperatures and low environmental humidity. It is also necessary to ensure that Roridula is correct lighting, preferably placing it in direct sun even during the summer season.

Roridula - Carnivorous plant

Roridula gorgonias is a perennial woody shrub belonging to the Roridulaceae family and is native to South Africa.
This particular plant is classified as semi-carnivorous, it is specialized in the capture of small insects but is totally unable to digest and assimilate the nitrogenous substances of the preys.
Thanks to a naturalistic symbiosis, some insects (the Pameridea roridulae) clean up the plant by feeding on the captured prey, the plant then absorbs the nutritional elements derived from their excrements.
The plant develops large bushes that can reach up to one and a half meters in height.
The leaves up to 12 cm long, are entirely covered by glands that secrete a sticky material similar to the resin and very different from the mucous one produced for example by the Drosera.
For the Roridula gorgonias there is no real winter rest, during the cold seasons, the plant slows down its growth rate even withstanding temperatures that are close to -10 ° with soils that must be slightly humid.
During the summer months, it particularly loves the sun's rays and blooms profusely in the months of February-March with jagged pink flowers whose diameter does not exceed 1 20 mm.
To those who intend to cultivate it, it should be suggested that this plant absolutely does not want closed places (eg terrariums), as it is particularly subject to attacks by fungi and molds.
One day of hot, humid and stagnant air, and the survival of the plant is irreparably compromised.
Furthermore, in the absence of "cleaning" insects, the prey captured by the plant must be removed manually to avoid that once decomposed, they damage the integrity of the plant itself.

Botanical name: Roridula gorgonias.

Geographical area: South Africa.

Vegetative period: February - October

Flower: Notched pink

Winter rest: It does not require a real winter rest, but a period with relatively cool temperatures during which it slows down its growth rate (November - January).

Watering: Abundant during the vegetative period, in winter keep the substratum moist.

Humidity: Not excessive, avoid places with stagnation of hot and humid air.

Temperature: During the winter 10 ° - 15 ° (even if it bears temperatures of -10 ° for a few days), in the remaining months 20 ° - 35 °.

Light: Loves the sun a lot, especially during the vegetative phase.

Repotting: Use a mixer of peat and perlite in equal parts.

Video: Carnivorous Plants. The Dr. Binocs Show. Educational Videos For Kids

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