Rudbekia (Rudbeckia) is a tall perennial (from 30 do 250 cm), with rather large flowers, single or full, yellow ones. Torsion leaves, single or complex, mostly mossy shoots. It is usually propagated by division and from cuttings with a heel” and by sowing seeds in the spring. Tall varieties are planted at intervals of 60-80 cm, low co 35-40 cm. It grows well in any soil, but not too dry. Likes a sunny or semi-shaded position. Tall varieties require supports and attachment.
Brilliant rudbeckia is planted on perennial beds and cut flowers (Rudbeckia fulgida) about height 30-60 cm. It has a very hairy stem and leaves. It blooms in August – October, giving out flower baskets (from one to several) diameter up to 12 cm, growing on long stems. It is in the basket 12-20 yellow lingual flowers, tubular flowers, dark brown, form the center of the basket.
In contrast, rudbeckia naked (Rudbeckia laciniata) the stem is naked and unbranched. Rough leaves, lower pinnate, the tallest ovate, whole bank. Lingual flowers are dark yellow, tubular – black-brown, spherical. July blooms – August. It grows with runners. It is propagated by division or by root runners. It reaches a height of 60 do 250 cm.
Different color of flowers, purple as the name suggests, ma rudbekia purpurowa (Rudbeckia purpurea) – plant approx 100 cm. The stem is rough, leafy, mostly not branching at the top. Leaves also rough, elongated, widening in the middle, slightly ovate. It reproduces by division, ain't easier to get it from seed.
Shining rudbeckia is also tall (Rudbeckia nitida) reaching a height to 200 cm. The leaves are light green, whole bank. Large flower baskets, yellow lingual flowers, dangling.
Two varieties are appreciated: Autumn sun i gold screen. The first one does not expand and does not require staking. Lingual flowers are pendulous, tubular flowers form a greenish conical center. The second variety has larger lingual flowers, more protruding, good for groups, especially on the water.