Senecio is a very large genus with about 1,250 species dispersed around the world. Some are lovely, and some, like the groundsels and ragworts, are noxious weeds. Some are tender perennials. There are about 100 succulent Senecios. Some are oddities and not suited to the garden, but they are certainly interesting.
There are some large shrubs, but many are small, trailing plants or spreading groundcovers. As with most succulents, they are drought- and heat-tolerant and not very cold-tolerant. Many Senecio species are toxic to animals. Use care and do not plant where animals or kids might be tempted to munch them.
Hardiness: Most fall somewhere around USDA Hardiness Zones 9 – 11. A few can tolerate brief periods of cold or dampness, but prolonged exposure will turn them to mush.
Soil: Senecios do not seem to be particular about soil pH. Something in the neural range (6.0 – 7.0) would be fine. More importantly, ensure the soil is on the sandy side and well-draining. Plants will rot if left damp.
Senecios can be grown from either seed or cuttings. Seeds prefer warm temperatures and constant moisture to germinate. Using cuttings is an easier and faster way to propagate Senecios. Take cutting during the growing season, early spring to fall, and root them in sandy soil in containers.
Established plants are extremely drought tolerant. They need water from spring to fall but do not leave the soil wet for prolonged periods. Allow the soil to dry out between waterings. Stop watering in winter when they are somewhat dormant. Since they are growing in sandy soil, nutrients need to be replenished. Fertilize annually, but lightly. Too much fertilizer will cause a lot of leggy growth.
Taller varieties can get floppy. You can prune them back to where the stem is firm in early spring. You can even root the cuttings.
Plants can be divided or repotted in early spring. If you grow them in containers, they enjoy spending the summer outdoors. Wait until there is no danger of frost and move them back indoors in the fall.
Pests and Problems
Few pests bother Senecios. They can occasionally be affected by scale and mealy bugs.
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