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The perennial Rudbeckias can also be used in naturalistic prairie plantings, in amongst grasses such as Stipa gigantea and Calamagrostis and other suitable plants such as Achillea, Persicaria, Echinacea and large Alliums. _g1 = document.getElementById('g1-logo-mobile-inverted-source'); The perennial varieties rarely die out from the middle of a clump as they age, and they can generally be left pretty much to their own devices. Set perennial black-eyed Susan in the garden in spring or fall. Most varieties will survive short periods of drought, but optimum moisture conditions will prolong the flowering period. It has won more medals and awards than Sir Chris Hoy, including the RHS Award of Garden Merit! The Rudbeckia Hirta seeds can also be started indoors 6-8 weeks before planting in spring. Rudbeckia’s flowers are typically yellow, but some orange, red and brown varieties have been developed. The rudbeckia, often called Black-Eyed Susan or Coneflower is a summer and autumn favourite. Confusion also arises wh… Another variety that can be grown as a half-hardy annual or as a short-lived hardy perennial, but this one has beautiful bright, rose-coloured flowers on tall stems up to 120cm in height. Germination should take about 2 weeks. It is a very useful and colourful cut-flower and has a vase life up to 10 days. Grow on in 9cm pots. The half-hardy biennials tend to be better suited than the larger perennials to life in a pot. They are good for cutting and will repeat flower. Towards the end of the flowering season, many gardeners choose to keep the dying flower heads intact to produce seed for the garden birds, or to collect it for winter storage and sowing the following spring. Your mum was probably growing an entirely different plant – Thunbergia alata – that is also known as black-eyed Susan. Some of the very best are the Rudbeckia hirta cultivars which produce robust, colourful blooms all summer long. An unusual variety with a yellowish rather than brown cone as well as yellow florets. Designing with contrasts of height, texture and form in mind is at least as important as the consideration of colour. Leaf spot begins with dark spots on the leaves: these gradually spread, and the affected leaves may eventually fall off the plant. This is the Maryland state flower. Stake tall plants to keep them from flopping. Plants should be watered whenever necessary during spring, summer and autumn to keep the soil moist. Black-eyed Susan does not require fertilizer. The annual and biennial types like ‘Cherokee Sunset’ and ‘Aries’ can be grown from seed in spring, while the perennial varieties like ‘Herbstsonne’ and ‘Goldsturm’ can be planted at any time of year. Get the best viral stories straight into your inbox! Cherokee sunset produces fantastic semi-double flowers in shades of brown-bronze on stems up to 50cm in height. 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. Rudbeckias generally grow well in positions with full sun, though most will tolerate some light shade for at least part of the day. It has an RHS Award of Garden Merit. That’s not what I expected – I thought they were daisies. Rudbeckia is very versatile and makes a great addition to flower borders, cottage gardens, containers, courtyard gardens, and certainly the cut flower garden. Leaf spot and powdery mildew are the most commonly encountered fungal diseases. Seeds sown in the spring will need to be stratified (subjected to a cold treatment to mimic winter conditions) for 3 months at 40°F. Mulch around black-eyed Susan to conserve soil moisture. 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