Roots range from woody taproots to more fleshy underground tuberous-thickened roots. These are perennials with fleshy taproots and caudices bearing erect stems and large, basal leaves. The roots are usually taproots, sometimes fibrous. Parsnips are grown for their fleshy, edible, cream-colored taproots. Members of the Asteraceae generally produce taproots, but sometimes they possess fibrous root systems. Taproots develop from the radicle of a seed, forming the primary root. The plant grows from thick taproots and several long hairy stems lay on the ground. Korean radishes, like other radishes, are an annual or biennial crop grown for the taproots. Taproots may develop in compact and stony soils. Taproots may aid in stabilizing the larger columnar cacti. Taproots are typically long and conical, although cylindrical and nearly-spherical cultivars are available. Annual herbs tend to have taproots with a developed system of secondary hair roots. Cushion plants have long taproots that extend deep into the rocky soil. Guar taproots can access soil moisture in low soil depths. They are erect plants, usually with long taproots.