Puya BERTERONIANA

Puya BERTERONIANA - Bertero's puya, Blue puya.

Very rare species!

Puya is a genus of perennial terrestrial bromeliad plants in the bromeliad family (Bromeliaceae), distributed from Costa Rica to South America. Most representatives of the genus are associated with open mountainous, rocky, and dry habitats, especially with the Andes and adjacent regions, where plants endure bright sun, winds, temperature fluctuations, and rapid soil drying.

The plants form dense or loose rosettes of long, stiff leaves, often with prickly or serrated margins. Unlike many tropical bromeliads, puyas are predominantly terrestrial xerophytic plants adapted not to standing water in the rosette, but to life in well-drained mineral soil. The sizes of genus representatives vary from compact species to very large rosette plants.

The flowers are gathered on sturdy peduncles in spike-like, raceme-like, or paniculate inflorescences. The flower coloration in different species can be greenish, yellow, blue, violet, red, or almost black. After flowering, fruits are formed with numerous seeds, in many species light and winged, capable of wind dispersal.

Bertero's puya is one of the rarest soil-dwelling bromeliad plants in cultivation today, native to Chile. The puya forms a rosette of silvery-green spiny leaves up to 1 m (3.3 ft) in height and width, and in spring it produces a massive peduncle up to 2 m (6.6 ft) tall, covered with the most remarkable emerald-turquoise flowers that have bright orange anthers contrasting with the petals. Turquoise color is extremely rare in the plant world, and even rarer is its combination with orange. The size of the inflorescence and its unusual color create an unforgettable impression. The flowers themselves are medium-sized, about 5 cm (2 in), but in total mass the flowering plant looks very massive.

Puya seeds are small, lightweight, flat or slightly winged, brown, adapted to wind dispersal.

Sowing is done superficially, without soaking. A sterile loose sowing substrate based on fine peat, sifted leaf mold, washed sand, and fine perlite is used. Seeds are distributed over the surface, slightly pressed against the moist soil and either left uncovered or sprinkled with a barely noticeable layer of sifted sand. Sowing is moistened from a spray bottle with a weak solution of potassium permanganate or biofungicide, if necessary with the addition of a growth stimulator: SUPERthrive, HB-101, Aminosol, Epin, or Zircon.

The container is covered with a transparent lid or placed in a mini-greenhouse. Germination is carried out in bright diffused lighting, without direct sun or overheating, at a temperature of 18–24 °C (64–75 °F). A slight difference between day and night temperatures can be beneficial, but constant dampness is undesirable. Sowings are aired daily, condensation is removed, and the substrate surface is kept slightly moist.

Seedlings may appear after 2-6 weeks, but germination in puya is often protracted and depends on temperature and humidity. After emergence, the cover is gradually opened, and seedlings are kept in bright diffused lighting and watered cautiously. Pricking out is carried out after the rosettes strengthen, when young plants are already convenient to transfer with a small clump of substrate.

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For puya, the brightest possible location with several hours of direct morning or evening sun is used. Southern, southeastern, and southwestern windows are suitable, and in summer maintenance on a balcony, terrace, or greenhouse with protection from prolonged rains is possible. After winter or maintenance in partial shade, the plant is accustomed to direct sun gradually. With insufficient light, the rosette becomes loose, leaves stretch out, and flowering is delayed.

During the period of active growth, a temperature of 18–28 °C (64–82 °F) is maintained; with good ventilation, the plant tolerates brief heat. A bright and cool overwintering is preferred, at 8–14 °C (46–57 °F), with infrequent watering. During the cool period, it is especially important that the roots do not sit in wet soil. When kept in a container, the root system cools faster and suffers from excess moisture, so cold dampness is more dangerous for puya than brief drought.

Watering is carried out moderately, only after thorough drying of the upper part of the soil. In the warm season, the root ball is soaked, but not left wet for long, and excess water from the tray is mandatory drained after 15-20 minutes. In the cool dormancy period, watering is greatly reduced. It is not necessary to constantly keep water in the center of the rosette: for puya, a dry ventilated rosette and healthy roots are more important than the funnel regime characteristic of many tropical bromeliads.

Loose, mineral, breathable, and fast-drying soil is used: leaf mold, a small amount of turf soil, coarse sand, fine gravel, pumice, zeolite, perlite, and a little charcoal. A drainage layer is mandatory placed at the bottom. Stable, not too deep pots with drainage holes are chosen, as the rosette becomes stiff and spiny over time.

Transplanting is carried out in spring, usually once every 2-3 years or after the pot is completely filled by roots. When working with the plant, thick gloves are used, as the leaf margins can catch and scratch skin. After transplanting, the plant is kept for several days without watering. Feeding is applied during the active growth period once every 4-6 weeks with a weak solution of fertilizer for bromeliads, cacti, or succulents. Excess nitrogen is undesirable, as it causes loose soft growth and reduces drought resistance.

Propagation in culture is possible by seeds and offshoots (lateral rosettes). Offshoots are separated only after forming their own roots or reaching sufficient size, cuts are dried, and planting is carried out in loose mineral substrate. The first waterings after separation are performed cautiously, without constant dampness.