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Rudbeckia hirta is an upright annual (sometimes biennial or perennial) growing 30–100 cm (12–39 in) tall by 30–45 cm (12–18 in) wide.It has alternate, mostly basal leaves 10–18 cm long, covered by coarse hair, with stout branching stems and daisy-like, composite flower heads appearing in late summer and early autumn.
Rudbeckia (/ r ʌ d ˈ b ɛ k i ə /) [4] is a plant genus in the Asteraceae or composite family. [5] [6] Rudbeckia flowers feature a prominent, raised central disc in black, brown shades of green, and in-between tones, giving rise to their familiar common names of coneflowers and black-eyed-susans.
Rudbeckia texana is a robust perennial growing up to 150 cm (59 in) tall by 30 cm (12 in) wide. It has alternate, mostly basal leaves 9–20 cm long. The leaves have a leathery texture and are elliptic in shape.
Rudbeckia triloba is a biennial or short-lived perennial herbaceous plant that grows to a height of 5 ft (150 cm) with a spread of up to 2.5 ft (75 cm). The primary stem has numerous branches, giving the plant an open, bushy appearance. The stems and branches are hairy and medium green, sometimes with a reddish color. The leaves are also hairy.
If pollinated the achenes mature and once seed is ripe the seedheads slowly break apart releasing seeds close to the plant. [9] Once dispersed, seeds require cold stratification in order to germinate once temperatures rise and the photoperiod lengthens. To germinate, these seeds require bare soil such as would be produced after herbaceous ...
Plant the seed in soil. When the stem is about six inches long, cut it back to three inches. (It seems counter-intuitive, but you’re trying to boost the root system.) When the roots are thicker ...
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