Asclepias INCARNATA

Asclepias INCARNATA - Swamp Milkweed, Rose Milkweed, Asclepias incarnata.

Asclepias is a genus of perennial herbaceous plants and shrubs in the Apocynaceae family, comprising 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 host plants for caterpillars of monarch butterflies.

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 long distances.

Asclepias INCARNATA features branched shoots about 1.2 m (3.9 ft) in height. The oppositely arranged leaf blades have slight pubescence and a broadly lanceolate or elongated shape. Fragrant flowers of red or purple-pink coloration are part of umbellate inflorescences reaching about 60 mm (2.4 in) across. Flowering begins in July or August, lasting slightly more than 4 weeks.

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

Seedlings emerge within 1-3 months. The maximum germination period can exceed 90 days. After the emergence of true leaves, pricking out is performed. Propagation by green 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-shady location. It tolerates direct sun well, but during periods of heat it is important to monitor soil moisture. When overdried, it may drop flower buds. Under apartment conditions, it needs 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 short dormant period at a temperature of 10-15 °C (50-59 °F) is possible. Watering is abundant in spring and summer, with drying of the upper layer; in winter, moderate. Stagnant moisture is undesirable.

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

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