Black Eyed Susan (Rudbeckia hirta) 3700 sds/g 6865
No wildflower garden is complete without some Black Eyed Susan somewhere in the border.
No wildflower garden is complete without some Black Eyed Susan somewhere in the border. This robust perennial will turn heads wherever planted and withstand more heat and drought than most. This favourite summer perennial blooms from July through to September and is an Ontario native plant. Golden yellow blooms with dark centres. Easy to grow, adaptable to most soils, trouble free and tolerant of heat and drought. Blooms well in full sun or light shade. Height 60-90 cm (2-3'). Avoid high fertility and irrigate only when absolutely necessary. Water soil below foliage, if possible. Hardy to Zone 3.
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How To Grow
3700 seeds/gram. This robust perennial will turn heads wherever planted and withstand more heat and drought than most. It is highly recommended to sow this type outdoors from September through October - select a site in full sun. This fall sowing allows any dormant seed to be naturally stratified over the winter. Seed can be started indoors in a soil-less mix from February to the beginning of March. Germinates at 20 C (70 F) in 14 to 21 days. Grow on under lights at a slightly cooler temperature before hardening off and transplanting outdoors to a sunny spot.
Blooming Season Begins
Start Indoors or Sow Direct in Fall
Days to Emergence
14 to 21
Medium Tall %2860 to 90 cm%29%2824 to 36%22%29
Degree of Difficulty
Native of Ontario
Native grass and flower blends.
Massing in sunny sites where soil is less than ideal.
For the seed from many native plants, late fall is the best time to sow seed directly outside. Why you ask? Simply put, many native plants produce seed that is viable but dormant. This means that while the seed has all the internal structures and nutrients required to germinate, the seed coat is so hard, water cannot pass through it and initiate germination. When seed is in this state, it is known as being dormant. Seed dormancy is a naturally selected for trait that protects the seed of many plants allowing them to safely overwinter and then be ready to sprout in more favourable conditions in spring.
The remedy to naturally breaking seed dormancy is typically the passing of time. In particular, seed overwintering outside and experiencing the natural freeze thaw cycles that occur in late fall, winter and early spring. This dormancy breaking process is called stratification.