Iris Rio de Oro - Tall Bearded Iris

Iris 'Rio de Oro' stands out for its resistance and generous balanced and well-formed flowers. The petals are golden yellow, while the sepals of the same tone are adorned with brownish stripes and spots. The beards stand out with their bright yellow glow. The plant quickly forms beautiful clumps that bloom in spring, giving several weeks of splendor in borders, rock gardens, and flower beds.

Iris germanica is a deciduous rhizomatous perennial plant that forms erect, vigorous clumps. It belongs to the family Iridaceae, which also includes plants such as Crocus, Gladiolus, and Crocosmia. Iris germanica, also known as Bearded Iris or German Iris, probably resulted from the hybridization of different botanical species. It is one of the most cultivated members of the Bearded Iris group, recognizable by the fine crest present on the sepals. These plants prefer neutral to alkaline soils and require a sunny exposure to thrive. The rhizomes need to capture the heat of the sun during summer to ensure optimal flowering. Traditionally, a minimum of six hours of sun per day is required.

The variety 'Rio de Oro' was obtained by Gordon Plough in 1983. Derived from the crossbreeding of 'Anon' and 'Island Fiesta', this excellent variety produces stems that reach 80 to 90 cm (32 to 35in) high when in bloom. It has sturdy floral stems that develop from the rhizomes, with well-built stalks carrying numerous flower buds. The clumps spread rapidly, without theoretical limits, as the central rhizomes become bare in favour of the outer rhizomes. The leaves are long and saber-shaped, a pronounced glaucous green with strong veins. Floral stems begin to appear in April and produce wide flowers measuring 12 to 14 cm (5 to 6in) that bloom from the top to bottom, from May until the end of June, depending on the climate. The vibrant colours of this plant are enhanced by the silky and iridescent texture. This variety also has a sweet and delightful fragrance.

Irises easily complement other plants, whether they are perennials, grasses, or shrubs. Select plants based on their specific requirements such as sun exposure and soil types, to ensure that their growth does not smother the iris rhizomes by opting for low-growing plants with light foliage, also consider their appearance and flowering period. Remember that clumps need to be divided every 3 or 4 years, so give them adequate space, preferably in well-drained, loose soil. For attractive floral borders throughout the growing season, associate irises with long-flowering perennials that tolerate dry soils, such as gauras, sages, or perennial geraniums. Columbines and California Poppies (Eschscholzia) bring lightness, while clematis creates an attractive backdrop. Use foxgloves for extra height. It is also important not to overlook foliage, like grasses, silver wormwoods (Artemisia), or euphorbias. Dense planting of old vigorous varieties can provide stabilisation on a slope, limiting maintenance. Tall irises can be used at the base of a wall, sheltered from the wind, with shorter and earlier varieties in the foreground. A few clumps of irises can also bring cheerfulness to the vegetable garden, and their beautiful flowers can be used to create bouquets.