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Oxalis tuberosa is a perennial herbaceous plant that overwinters as underground stem tubers. These tubers are known as uqa in Quechua, [1] oca in Spanish, yams in New Zealand and several other alternative names. The plant was brought into cultivation in the central and southern Andes for its tubers, which are used as a root vegetable.
Oxalis trilliifolia – great oxalis, threeleaf woodsorrel; Oxalis tuberosa – oca, oka, New Zealand yam; Oxalis valdiviensis – Chilean yellow-sorrel; Oxalis virginea – virgin wood-sorrel; Oxalis versicolor – candycane sorrel; Oxalis violacea – violet wood-sorrel; Oxalis vulcanicola – volcanic sorrel or velvet oxalis [12] [13]
The bulbs are produced to satisfy the demand for bulbs for parks, gardens and as house plants, in addition to providing the bulbs necessary for the production of cut flowers. The international trade in cut flowers has a worldwide value of approximately 11,000 million Euros, which gives an idea of the economic importance of this activity.
Oxalis tuberosa (oca or New Zealand yam) Plectranthus edulis and P. esculentus (kembili, dazo, and others) Solanum tuberosum (potato) Stachys affinis (Chinese artichoke or crosne) Tropaeolum tuberosum (mashua or añu) Ullucus tuberosus (ulluku)
In New Zealand, oca (Oxalis tuberosa) is typically referred to as "yam". [8] [9] In Malaysia and Singapore, taro (Colocasia esculenta) is referred to as "yam". [10] In Africa, South and Southeast Asia as well as the tropical Pacific islands Amorphophallus paeoniifolius is grown and known as "elephant foot yam". [11]
Flowering plant bulbs are planted beneath the surface of the earth. The bulbs need some exposure to cold temperatures for 12 to 14 weeks in order to bloom. [1] Flower bulbs are generally planted in the fall in colder climates. The bulbs go dormant in the winter but they continue to absorb water and nutrients from the soil and they develop roots ...