Encyclopedia - Plants for ponds
Marsh marigold
Caltha
Description: the genus includes about 40 species occurring in the temperate zone of both hemispheres. Perennial plants with branched stems and rounded smooth leaves with a cordate base. Flowers yellow.
The growing interest in the landscape style of gardens, so characteristic of Russian garden-park art, has prompted gardeners to turn their attention to decorative, hardy, easily propagated and little-cultivated plants. Marsh marigold has proved to be such a plant; its exceptional decorative value, the wide range of some species, pronounced intraspecific variability, and its early and long flowering period make it particularly interesting for designing picturesque areas of the shoreline of water bodies.
Position: requires open sites with sufficient moisture. In this case they flower most abundantly. But they also tolerate shade to partial shade.
Soil: since marsh marigolds in nature are plants of wet places, they need rich, well-moistened soil. With constant watering they can also grow in dry sites.
Propagation: with freshly collected seeds ripening in June. When sown immediately after ripening they germinate at the end of summer; if sown in autumn, seedlings appear in spring. For spring sowing staged stratification is recommended: about a month at 10°C, then two months at 18–20°C. Germination occurs at 18–20°C. Seedlings flower in the second to third year. Marsh marigolds can be propagated by division of the clump, preferably in autumn. They can also be propagated by cuttings throughout the growing season.
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