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This taller cousin of the classic Black-eyed Susan, Rudbeckia subtomentosa has excellent deep green foliage and produces an abundance of 3 inch wide yellow flowers with shimmering reddish-brown centres during the heat of summer. The showy blossoms create a brilliant burst of colour that lasts for many weeks in late summer through fall. When blooming, it has a pleasant sweet smell, similar to that of Sweet Grass, hence the common name. Growing three to five feet tall, Sweet Black-eyed Susan prefers medium to moist soils and thrives in clay!
Attracts Butterflies & Songbirds! Claybuster! Deer Resistant! Makes Great Cut Flowers!
Indoors: Cold, moist stratification. Start at least 5 weeks before outdoor night temperatures are reliably in the 10 C (50 F) range. Mix the seed with a slightly moistened, sterile, soil-less growing mix. Put this in a labelled, sealed plastic bag and store in a refrigerator for one day. The next day place this in the freezer for one day. Repeat this for one week, alternating between the fridge and the freezer. After stratifying, plant seed 0.32 cm (1/8 inch) deep in pots. Keep moist but not soggy and very warm (21 C - 70 F). When seedlings are 5 cm (2 inches) tall or more, transplant into the garden spaced 30 cm (1 foot) apart. Outdoors: Plant seed 0.32 cm (1/8 inch) deep in a prepared seed bed in late fall so that the seed overwinters and germinates naturally in spring. Outdoors Alternative: In late fall through to mid-winter fill plastic pots with a slightly moistened, sterile, soil-less growing mix. Plant seed 0.32 cm (1/8 inch) deep in pots and label the pots. Place them outdoors in an area where they will experience the snow and cold of winter. The seed will germinate in the pots in spring as the weather warms up. Be sure to water the pots regularly in spring and once the plants are 5 cm (2 inches) tall, transplant them into your garden.
