Silphium trifoliatum
This perennial species grows up to 1.50 m tall. It produces pointed leaves grouped in 3s along the stem and an abundance of yellow flowers with 12 to 15 petals.
The abundant seeds appeal to many garden birds. They are self-sowing.
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in bucket
Perennial seeds require a wintering period for germination. Place them in the fridge for 60 days before sowing in spring. Sow in trays, making sure the seeds are lightly covered, as they germinate in the light. When the plants have 5 to 6 leaves, transplant into individual cups or directly into warmed soil. Autumn seedlings are sown in the same way and left outdoors until spring.
January, February, March, April, October, November, December
July, August, September
in the ground, in pot
semi-shade, sunny
medium
clayey, sandy, humus
drained, sec, fees
Silphium trifoliatum
mid-season
30 seeds
Yellow
From 100 to 150 cm
From 5 to 7 cm
pointed
North America
