Plant atlas

Geographical Origin and Habitat: Species within the genus Oldenlandia are widely distributed across tropical and subtropical regions of Asia, Africa, and Australia. In their natural habitats, they are frequently found in humid, semi-aquatic, or fully submerged environments, such as the edges of slow-moving rivers, ponds, and rice paddies. These environments are typically characterized by fresh, nutrient-rich waters, often with silty or clay substrates, and ample sunlight.

Taxonomy & Genetics: Oldenlandia sp. belongs to the vast Rubiaceae family, an extremely diverse botanical group comprising over 13,000 species, including economically important plants like coffee and quinine. This family is well-known for its opposite leaf morphology and interpetiolar stipules. Precise classification of a specific Oldenlandia species often requires detailed analysis of floral and reproductive characteristics, which subtly differ among various forms.

Physical Structure: Oldenlandia sp. typically presents as a stem plant with an upright growth habit, characterized by slender yet sturdy stems that can branch abundantly. Its leaves, usually small and lanceolate or oval, are arranged in whorls or opposite pairs along the stem, giving it a dense, bushy appearance. This structure makes it ideal for creating a filling effect and depth in the midground of the aquarium, forming a lush green carpet if pruned regularly.

Color & Texture: The distinctive color of Oldenlandia sp. is a bright and vibrant green, which can vary slightly in hue depending on light intensity and nutrient availability. Its small leaves and dense branching create a fine and delicate texture, adding an element of visual sophistication to the aquarium. This contrast between the fineness of the leaves and the intense green makes it an excellent focal point or a transition plant between larger-leaved plants and foreground varieties.

Lighting & CO2: For optimal growth and vivid coloration, Oldenlandia sp. requires medium to high lighting, preferably with a photoperiod of 8-10 hours per day. Under more intense light conditions, the plant will develop more compact stems and richer coloration, while insufficient light can lead to stem elongation and weakening. CO2 injection is highly recommended to maximize growth rate and overall health, promoting efficient photosynthesis and preventing algae formation on its delicate tissues.

Nutrition & Substrate: Although Oldenlandia sp. can absorb nutrients directly from the

Water Chemistry: Oldenlandia sp. prefers soft to moderately hard water, with a KH range between 2.0 and 14.0, and a slightly acidic to neutral pH, ideally between 5.0 and 7.0. Maintaining these parameters stable is crucial to avoid plant stress and promote healthy growth. Water temperature should be kept between 20.0 and 30.0 °C, reflecting its tropical and subtropical origins; extreme fluctuations can compromise its vitality and disease resistance.

Space Management & Placement: Given its medium growth rate and branching habit, Oldenlandia sp. is perfectly suited for midground placement in the aquarium, where it can form dense and attractive bushes. To maintain a compact shape and encourage bushier lateral growth, it is advisable to plant it in groups of several slightly spaced stems. Ensuring adequate space between groups prevents mutual shading and guarantees proper water circulation, helping to keep the lower parts of the plant healthy.

Pruning: Regular pruning is essential to keep Oldenlandia sp. in shape and to stimulate bushier, denser growth. Trimming the upper tips of the stems encourages lateral branching, transforming a tall, slender plant into a compact, lush bush. Cuttings obtained from pruning can be easily replanted into the substrate to propagate new plants, helping to further fill out the aquascape and maintain the vitality of the colony.

Risks & Diseases: Oldenlandia sp., while relatively robust, can be susceptible to common aquarium problems, such as algae invasion, especially if the balance between light and nutrients is not optimal. Nutrient deficiencies, particularly of iron or potassium, can manifest as leaf chlorosis or holes, indicating the need for fertilization supplementation. Sudden changes in water parameters or insufficient flow can also cause stress to the plant, leading to stunted growth or the deterioration of lower leaves.