Pachyphytum RZEDOWSKII

Pachyphytum RZEDOWSKII - Rzedowski's pachyphytum, Pachyphytum rzedowskii.

Pachyphytum is a genus of compact leaf-succulent plants in the stonecrop family (Crassulaceae), comprising about 10 species native primarily to the mountainous regions of Central and Northern Mexico. These plants are adapted to bright sun and significant daily temperature fluctuations, storing moisture in fleshy leaves and enduring prolonged periods of drought.

Representatives of the genus are perennial low-growing succulents with short fleshy stems 15-30 cm (6-12 in) long and a branched system of thin roots. The leaves are thickened, short-petioled, up to 4 cm (1.6 in) long, spirally arranged and forming dense rosettes. The surface is covered with a waxy coating with a silvery sheen, giving them a grayish-white, glaucous, or bluish-green hue, which is why the plant is often called "moonstone". The peduncles are long, bearing nodding racemes of bell-shaped flowers of pinkish-orange or reddish color, sometimes with greenish petal tips.

Flowering is observed in spring and summer. After blooming, dry multi-seeded fruits form.

Rzedowski's pachyphytum is a succulent plant forming rosettes at the ends of stems. The rosettes range from loose to compact, up to 7 cm (2.8 in) in diameter. The stems lie close to decumbent trunks, up to 30 cm (12 in) long and up to 1.5 cm (0.6 in) in diameter. Spirally arranged leaves range from bluish-green to pale gray, up to 4.5 cm (1.8 in) long and 1.3 cm (0.5 in) wide. Flowers ranging from green to whitish-yellow at the base and bluish-green at the top, with a red spot inside, appear on green or pinkish stems up to 25 cm (10 in) long.

The seeds are characterized by a low natural germination rate, not exceeding 50%. Before sowing, seeds are soaked in warm water for 12-24 hours. Sowing is carried out in a loose substrate of leaf mold and sand or in a light sandy-peat mix, buried no more than 2-3 mm (0.08-0.12 in). The soil is moistened from a spray bottle and covered with glass or transparent plastic wrap to maintain constant humidity. Germination is carried out in the light, but without direct sunlight, at a temperature of 22-26 °C (72-79 °F). Daily ventilation and humidity monitoring are conducted, avoiding both drying out and waterlogging.

Seedlings appear within 15-25 days, the minimum period is about 15 days, and the maximum possible is more than 40 days. After the appearance of the first small leaves, the cover is removed, and young plants are gradually acclimated to open air and bright light. Pricking out is not required - seedlings are transplanted into individual pots as they grow.

Special notes: Seeds are very (!) small.

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Pachyphytum is very simple to grow under indoor conditions. It prefers bright diffused light; keeping it in partial shade will not kill the plant, but will lead to loss of compact growth habit, leaf discoloration, and absence of flower stalks. South-, east-, and west-facing windowsills are optimal placements. On northern windowsills and during the winter period, it requires supplemental lighting. Maintenance temperature in spring-summer is 20-25 °C (68-77 °F), in winter 11-16 °C (52-61 °F); temperatures of 10 °C (50 °F) and below are fatal to the plant. It tolerates dry air well and does not require additional humidity; droplets of moisture falling on the leaves can wash away the waxy coating and ruin its appearance. Summer watering should be regular, but with mandatory drying of the soil by one-third, as excessive moisture leads to root and stem rot. Winter watering is reduced to a minimum.

Small containers with well-drained substrates are used for cultivation. A mixture of equal parts garden soil, fine pebbles, and sand, or ready-made potting mixes for succulents and cacti can be used. It is repotted in spring once every two years. Feeding is carried out 3-4 times between April and October with mineral fertilizers for cacti with minimal nitrogen content and a predominance of potassium. Pachyphytum is resistant to diseases and is not susceptible to insect attacks.