Pterocarpus SANTALINUS

Pterocarpus SANTALINUS - Red Sandalwood, Red Sanders, Rakta Chandan.

Golden Line of Ayurveda!

Pterocarpus is a genus of woody plants in the legume family (Fabaceae), comprising about 30 species distributed in tropical and subtropical regions of Asia, Africa, and the Americas. Representatives of the genus are found in dry and seasonally wet forests, on plains, and in foothills, forming an important component of local ecosystems. Many species are valued for durable wood, ornamental appeal, and drought resistance.

The genus is represented by deciduous or semi-evergreen trees of medium and large size with a massive trunk and a broad crown. The leaves are alternate, compound, odd-pinnate, with leathery leaflets. Flowering usually occurs in the warm season, often coinciding with the period of active growth.

Flowers are papilionaceous, gathered into panicles or corymbose inflorescences. The fruits are characteristic for the genus - flat winged pods (samaras) that facilitate wind dispersal of seeds. Seeds are usually solitary or paired, hard, with a dense coat.

Red sandalwood is a slow-growing deciduous tree reaching 8-12 m (26-39 ft) in height in nature. The trunk is straight, with dark fissured bark. Young shoots are smooth, greenish. The leaves are odd-pinnate, with 3-7 oval leaflets, firm and smooth, dark green in color.

Flowers are small, yellow, gathered in loose inflorescences. Flowering is observed in the dry season. The fruits are rounded, flat, with a pronounced wing, becoming brownish upon ripening. The wood has a characteristic rich reddish-brown coloration that deepens with tree age.

Pterocarpus santalinus is a slow-growing deciduous tree reaching 8-15 m (26-49 ft) in height in nature. The trunk is straight, strong, with dark gray or brownish bark that fissures with age. Young shoots are smooth, greenish. The crown is relatively compact, rounded. The leaves are alternate, odd-pinnate, consisting of 3-7 oval or elliptic leaflets with a smooth surface and dark green coloration. Flowering occurs in the dry season. Flowers are small, yellow, gathered into loose paniculate inflorescences located at the ends of shoots.

The fruits are flat rounded pods with a pronounced winged margin, containing a single seed. Ripened fruits often persist on the tree for a long time. The wood is extremely dense, heavy, with a characteristic rich reddish-brown coloration that intensifies as the plant matures and serves as the main distinguishing feature of the species.

Seeds are medium-sized, about 6-8 mm (0.2-0.3 in) long, dense, rounded, enclosed in flat winged pods. Preliminary scarification is necessary (without breaking the outer coat, germination does not exceed 30-40%); for this, the outer coat is carefully filed or scratched with a hard tool without damaging the seed interior. Before sowing, seed material is soaked for 24 hours in warm water with the addition of stimulants (SUPERthrive, HB-101, Aminozol, Epin, or Zircon). Pre-treatment makes it possible to increase the overall germination rate to 60-80%.

Sowing is performed in a light, well-aerated substrate based on coco coir with the addition of inert aerators (perlite, vermiculite, coarse sand). Seeds are laid out horizontally flat-side down and embedded by 1-1.5 cm (0.4-0.6 in). The substrate is pre-moistened, the container is covered with film, and placed in a warm spot at a temperature of 24-30 °C (75-86 °F), preferably using bottom heat. Regular ventilation is carried out, and waterlogging is ruled out.

Sprouts appear after 15-30 days, the usual minimum germination period is about 12-14 days, and the maximum possible can reach 45-60 days. After the formation of 2-3 true leaves, careful pricking out is performed. In the first years, seedlings develop slowly and require stable growing conditions.

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For cultivation, bright illumination with access to direct sun during most of the day is provided. Under indoor conditions, the plant is placed near south- or southeast-facing windows. During the warm season, outdoor maintenance is possible with protection against waterlogging.

Optimal temperature is maintained within 20-30 °C (68-86 °F). Short-term drops in temperature are tolerated, but at values below 10 °C (50 °F) growth slows. Moderate watering is conducted, with soil drying between waterings. Waterlogging is not allowed.

A well-drained substrate based on sod soil with the addition of sand and perlite is used. Repotting is carried out rarely, as the root system develops. A stable and deep pot is selected. Fertilizer is applied during the active growth period once a month with complete fertilizers. Crown shaping is usually not required; only sanitary pruning is carried out. Propagation is carried out by seeds.