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Peronospora destructor is a plant pathogen. It causes downy mildew on leaves of cultivated and wild Allium. Allium cepa (onion and shallot) is most often affected, while Allium schoenoprasum (chives) and Allium porrum (leek) are only occasionally affected. Downy mildew is a major disease of onion. [1]
Allium munzii is a perennial plant that is a part of the lily family. [3] It has a normal plant life cycle spanning over two years. Germination begins from a reddish-brown bulb underground. [3] Each plant takes around three to five years to reach sexual maturity. [3] Adequate rainfall is necessary for the plant to bloom due to soil moisture ...
Tree onion bulblets will sprout and grow while still on the original stalk. The bulblets are usually marble-sized, between 0.5 cm to 3 cm in diameter. They may bend down under the weight of the new growth and take root some distance from the parent plant, giving rise to the name "walking onion".
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Plants that have an underground storage organ are called geophytes in the Raunkiær plant life-form classification system. [ 2 ] [ 3 ] Storage organs often, but not always, act as perennating organs which enable plants to survive adverse conditions (such as cold, excessive heat, lack of light or drought).
Allium stellatum is a perennial forming a bulb underground. An erect, leafless scape up to 30–60 centimetres (1–2 ft) tall arises from grass-like basal leaves that are up to 30 centimetres (1 ft) long. [4] [5] The leaves die back as the rounded umbel of pink to purple flowers [4] forms at the end of the scape
The potato onion (also known as an Egyptian onion, underground onion [1] or multiplier onion) [2] is a group of varieties [3] which Maud Grieve calls Allium × proliferum [1] but has also been classed in the Aggregatum Group of Allium cepa, similar to the shallot. [3]
Toxicoscordion venenosum is a bulb plant 20–70 centimeters tall when flowering in the spring or early summer. The underground bulbs are egg-shaped (ovoid) and made of up of multiple layers protected by dried outer layers (tunicate) like an onion. [5] The plant's leaves appear very early in the spring and are narrow. [6]