The Senecio plant genus consists of many members; these can be half hardy annuals or half hardy perennials and range in height from 30 to 90 cm.
Many Senecio have an attractive grey foliage.
The time that Senecio blooms depends on the species (from early spring through to late on in the winter).
Senecio vernalis - Eastern groundsel by Matvey Andreyev, CC.
They carry yellow daisy-like flowers. Some common names for Senecio include Ragwort, Cineraria, Groundsel, Chalksticks and Dusty Miller.
Due to the large range in the Senecio genus it is difficult to describe accurately how to grow all the species.
It is important that you do not grow hybrid Senecio plants from seeds as they will not keep true; grow from purchased plants or divided plants. Put out following the last frost of spring).
Senecio serpens by Jason baker.
If growing Senecio species such as Ragwort, Dusty Miller, Blue Chalksticks and Groundsel from seed then sow them in the springtime on the soil surface.
Most species prefer sunny conditions and are tolerant of partial shade. Soil should be of an ordinary nature and well drained.
If starting indoors, the seeds will take about two to three weeks to germinate at 18 to 22 degrees centigrade and should be grown in the light and watered from below, as Ragwort are easily damaged by water.
Plants should be put out following the last frost at a spacing of 15 cm (smaller Senecio varieties) through to 60 cm for larger species.
Senecio mandraliscae by Pamla Eisenberg.
Senecio serpens (Blue Chalksticks) plants and similar should be cut back every spring. In prolonged dry periods give Ragwort, Groundsel, and other Senecio plants a light watering. If you require more plants then propagate Senecio by division in the spring-time.
Common Names: Ragwort, Groundsel, Dusty Miller, Butterweed, Blue Chalksticks, String of Pearls, Old Man in the Spring, Grimsel, Blue Chalk Fingers, Squaw Weed.
Scientific names: Senecio vulgaris, S. cineraria, S. rowleyanus, S. jacobaea, S. mandraliscae, S. serpens, S. aureus, S. articulatus, S. macroglossus, S. confusus, S. madagascariensis and S. vitalis.
Life Cycle: Half hardy annual. Half hardy perennial.
Height: 4 to 40 inches (10 to 100 cm).
Native: Americas, Europe, Asia, Africa.
Growing Region: Zones 3 to 10. As a perennial in zones 7 to 10.
Flowers: Spring, summer, autumn, winter: species dependent.
Flower Details: Yellow, pink. Ray florets. Rayless. Daisy-like. Clustered.
Foliage: Grey, silver, green. Pinnate. Lobed. Hairy.
Sow Outside: Surface. Before the last frost or in autumn. Spacing 4 to 30 inches (10 to 75 cm).
Sow Inside: Vermiculite. Water from below. Germination time: one to three weeks in the light. Temperature 70°F (21°C). Seven or eight weeks in advance. Transplant outdoors following the last frost or in autumn in warm areas.
Requirements: Full sunlight. Good drainage. Ordinary soil. Regular watering during dry periods. Pinch tips. Prune once flowering has completed. In autumn. Deadhead. Perennials should be cut back in spring. Propagate perennials: dividing in the spring.
Closely Related Species:
Miscellaneous: Usually grown for their attractive foliage.