Rudbeckia - Seeds

Rudbeckia - Seeds

(sunflower family)

Height: 20 to 100 inches (50 to 250cm).
Growing Region: Zones 2 to 10.
Flowers: Summer.
Flower Details: Yellow, gold/orange. Daisy-like ray and disc florets. Cone-shaped.
Foliage: Arranged spirally. Entire. Lobed.

Sow Outdoors: Surface. A couple of weeks before the last frost. Spacing 12 to 40 inches (30 to 100 cm).

Sow Indoors: Mix seeds in a growing medium, place in a freezer bag, keep moist, keep moist, then stratify by refrigeration for two weeks. Germination time: one to three weeks. Temperature 70°F (21°C). Seven or eight weeks before expected last frost. Transplant outdoors following the last frost.

Requirements: Full sunlight or light shade. For best results: soil pH 5.5 to 7. Good drainage. Provide support for tall varieties. In the spring supply a top dressing of cow manure. Regular watering during hot spells. Deadhead. Divide plant every three years in the spring on cool areas or autumn in warmer areas. Propagate: cuttings in the spring.

How to grow:
The seeds of coneflower and related Rudbeckia should be sown on the soil surface a couple of weeks before the last frost of spring is expected. Ideally the plants should be grown in an area that has good drainage and a heavy soil pH that is slightly acidic to neutral (pH 6 to 7). Coneflowers can be grown in either sunny or partially shaded areas of the garden and should be spaced at 35 to 45cm apart (small Rudbeckia) or 70 to 90cm apart for larger Rudbeckia varieties.
If starting off coneflowers indoors then you will first need to imbibe the coneflower seeds by placing them in a fridge (within soil, in a plastic bag) for two weeks. The seeds should them besown about a month and a half before you expect the last frost; they require light and a temperature of 20 to 22 degrees Centigrade to germinate; Germination of coneflower should take from one to three weeks. Once established plant outdoors after the last frost.

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