Arctotheca calendula aka Capeweed

Arctotheca calendula is a low-growing annual herb, with stems that rarely exceed 30 cm in height. It spreads horizontally via stolons and can colonize bare ground quickly, forming dense mats. Basal leaves are 5–25 cm long, white-woolly on the undersides.

Arctotheca calendula is native to southern Africa, occurring naturally along the coasts and in the Namaqualand, Karoo, and Cape Peninsula regions of South Africa, as well as in Lesotho. It has been introduced — in many cases accidentally — to Australia, New Zealand, California, Chile, and parts of southern Europe, where it is considered invasive.

Capeweed tolerates a wide range of soil conditions, including poor, sandy, and saline coastal soils. It thrives in disturbed ground, pastures, and sand dunes. It does not require fertile soil to establish successfully.

Arctotheca calendula grows best in full sun. It is adapted to open, sunny coastal and disturbed habitats and does not tolerate shade well.

The plant is hardy to moderate frost and performs well in Mediterranean-type climates. It tolerates coastal salt exposure and dry conditions typical of its South African native range.

In the Southern Hemisphere, capeweed flowers from approximately July to December depending on location, with fruiting extending into April in New Zealand. In the Northern Hemisphere it typically flowers March to June. Being an annual, it completes its life cycle within a single growing season, reproducing prolifically by seed.

The flowers are daisy-like, borne singly on stems, approximately 3.5–5 cm in diameter. Ray florets are yellow, sometimes with a faint green or purple tint, surrounding a dark (often black) disc. Each head bears fewer than 20 ray florets.

Arctotheca calendula may be confused with related species including Gazania rigens and G. linearis (distinguished by capeweed's lobed leaves and absence of latex-containing stems) and Arctotis stoechadifolia (distinguished by that species' purple ray florets).

Capeweed is best suited to outdoor cultivation in full sun in warm-temperate to Mediterranean climates. It tolerates moderate frost, poor soils, and coastal conditions. It spreads aggressively by seed and stolon in disturbed or bare ground.

Arctotheca calendula reproduces prolifically from seed, which is dispersed by wind, human activity, and sand movement. It also spreads vegetatively via stolons. Seed production is abundant, which accounts for its invasive spread in introduced regions.

Arctotheca calendula belongs to the Asteraceae family and produces composite flower heads. As a member of this family, it is primarily pollinated by insects attracted to the conspicuous yellow ray florets.

If you're looking for a plant that offers a moderate level of challenge, Capeweed is a great choice to test your gardening skills.

Capeweed should be watered regularly, allowing the soil to dry out between waterings.

Ploi lacks confirmed information on the toxicity of this plant. If you, a relative, or your pet accidentally consume plant material with unknown toxicity, it's best to consult a medical expert.