Bidens Common name: Tickseed,                         Burr Marigold	Indicates sun requirement      Full sun      Half sun      Semi-shade      Shade   Indicates Water requirement         High water requirement.     Water every 1-2 days.          Medium water requirement.     Water every 3-7 days.          Low water requirement.     Water every 7-14 days.
Description Closely related to Cosmos, this genus of around 200 species of annuals, perennials, subshrubs and shrubs occurs in most parts of the world except very cold regions. In most countries this genus is represented only by a weedy species. The majority are native to Mexico and adjacent regions of the Americas. The plants have erect leafy stems, usually much branched, with opposite pairs of leaves that are generally compound or deeply divided. Yellow daisy flowers (occasionally red to purple, for example, the purplish pink Bidens aequisquamea), mostly with very few but broad ray-florets, open in a long succession and are followed by burr-like seed heads containing narrow seeds, each tipped with 2-barbed bristles that can stick to clothing and the fur of animals.
Growing Plant in full sun or morning shade, and water well in summer. They are very easily grown in any well-drained soil. Although hardiness varies with the species, most will withstand moderate frosts. Propagate from seed or cuttings, or by division, depending on the growth form.