Asclepias PHYSOCARPA

Asclepias PHYSOCARPA - Balloon plant, Hairy balls milkweed, Swan plant, Bladderpod, Gomphocarpus PHYSOCARPUS.

Asclepias is a genus of perennial herbaceous plants and shrubs in the dogbane family (Apocynaceae), numbering about 200 species distributed predominantly in North and South America.

These plants are known for their milky sap, complex inflorescences of small bright flowers, and an important role in the ecosystem - especially as food plants for monarch butterfly caterpillars.

The fruit is a spindle-shaped follicle about 6-7 cm (2.4-2.8 in) long. Numerous seeds ripen inside, equipped with long silky hairs that aid in wind dispersal. After the fruits open, they are easily carried over great distances.

Balloon plant is a subshrubby perennial herbaceous plant that can grow over 180 cm (5.9 ft) in height. It blooms in the warm months. It prefers moderate moisture, sandy and well-drained soils, and sun. The flowers are small, with white hoods, about 1 cm (0.4 in) across. The leaves are light green, linear-lanceolate. Seeds have silky tufts. The plant serves as a food source for butterflies.

Before sowing, seeds are soaked in warm water for 24 hours. Sowing is carried out in a container with a loose mix, lightly sprinkling soil on top. The container is kept at a temperature of 18-25 °C (64-77 °F). Sowings are covered with film or glass, regularly ventilated, and moistened. When grown indoors, bright diffused lighting is provided.

Seedlings appear within 1-3 months. The maximum germination period can exceed 90 days. After the appearance of true leaves, pricking out is carried out. Propagation by softwood cuttings is also possible - they root easily in a moist substrate at a temperature of 22-24 °C (72-75 °F).

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Asclepias prefers a sunny or semi-shaded location. It tolerates direct sun well, but during periods of heat it is important to monitor soil moisture. When overdried, it can drop buds. Under apartment conditions, it requires a bright windowsill; in summer, it can be grown outdoors.

The temperature regime during the growing season is 20-26 °C (68-79 °F). In winter, a brief dormant period is possible at a temperature of 10-15 °C (50-59 °F). Watering is generous in spring and summer, with drying of the top layer, and moderate in winter. Moisture stagnation is undesirable.

A loose soil is used, with the addition of sand, humus, or perlite. Repotting is carried out annually in spring. Fertilizers are applied twice a month during the period of active growth and flowering. Universal or potassium-phosphorus fertilizers are used in moderate doses.

Formative pruning promotes branching and prolonged flowering. Plants grown from seeds begin to flower as early as 4-5 months after sowing. It is suitable for cultivation in containers and in open ground as an annual plant.