Sedum PALMERI 'RUBROMARGINATA'

Sedum PALMERI 'RUBROMARGINATA' - Palmer's Sedum 'Rubromarginata', Palmer Sedum, Stonecrop.

Sedum, or stonecrop, is one of the largest genera in the Crassulaceae family, comprising over 400 species of annual and perennial succulents. They are distributed primarily in the Northern Hemisphere and grow on poor soils of dry stony and sandy steppes, slopes, and dunes.

The plants are low-growing, with fleshy stems and thick succulent leaves that serve as water reservoirs and help survive drought. Species vary widely in shape and size: some form dense clumps, while others trail along the ground in a continuous mat of green, glaucous, or bronze-red leaves. In evergreen species, foliage turns distinctly red in winter.

The flowers are small, star-shaped, mostly five-petaled, white, yellow, pink, or lilac, gathered in corymbose or paniculate inflorescences and often changing hue during flowering. The fruit is a follicle cluster with very small seeds.

Sedum palmeri is a species from northeastern Mexico, from the Sierra Madre Oriental, where it grows on mountain slopes in the states of Tamaulipas, Nuevo Leon, and Coahuila. It is a subshrub up to 25 cm (10 in) high and up to 50 cm (20 in) across: stems grow upright at first, and later bend and trail along the ground.

The leaves are flat, fleshy, greenish-blue, 2-4 cm (0.8-1.6 in) long, gathered in loose rosettes at the ends of shoots. In winter and under bright sun, the leaf margins blush reddish-pink, which gave the cultivar form its name 'Rubromarginata' - "red-margined". The flowers are yellow, star-shaped, gathered in paniculate inflorescences.

Sedum seeds are very small, almost dust-like, and mature in dry follicle clusters. Soaking such seeds is impractical, so the substrate itself is disinfected: before sowing, it is drenched with a weak solution of potassium permanganate and dried slightly. Scarification is not required, but cold stratification is necessary.

Sowing is carried out on the surface, without burying, into a container with a loose, well-drained substrate. The sowing is moistened from a spray bottle with a growth stimulant solution: SUPERthrive, HB-101, Aminozol, Epin, or Zircon, covered with glass or film or placed in a propagator, and placed in a refrigerator at a temperature of 5-7 °C (41-45 °F) for exactly 14 days.

After stratification, the sowing is moved to a warm, bright place at a temperature of 18-20 °C (64-68 °F). Under favorable conditions, the first seedlings appear as early as the 15th day, the main germination is completed by the 30th day, and individual seeds may linger longer. Throughout this time, sowings are regularly ventilated, humidity is kept even, without waterlogging or drying out. Pricking out is carried out after the appearance of the first two true leaves, into individual small pots.

Special notes: The seeds are extremely small!

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The plant prefers direct sun, but also tolerates light shading. The vibrancy of the red margin along the leaf edge depends specifically on the amount of light.

Sedum palmeri tolerates cold better than many of its relatives. In the garden, growth is covered in late November or early December if there is no natural snow cover, and in early spring, after frosts end, dead shoots and dry branches are removed: all winter they served as additional protection against the cold. In indoor culture, overwintering is bright and cool.

Watering is only done as the substrate dries out. The plant does not tolerate frequent overwatering or standing water: stems and roots rot from them.

The substrate needs to be poor or moderate in nutrients, loose, and well-drained, with the addition of coarse sand or perlite. Drainage is placed at the bottom of the pot.

Sedums practically do not need feeding; they do not like rich soil. In early spring, a small amount of universal fertilizer can be applied, but no more.

There is no need for formative pruning. If the clump overgrows heavily, it is divided and replanted in spring or autumn. In addition to seeds, Sedum palmeri is easily propagated by shoots and individual leaves: a dried leaf placed on a moist substrate roots on its own.