Lettuce (Lactuca sativa) belongs to the daisy family, Asteraceae. It is a hardy annual that is easy to cultivate and most often grown for its leaves. It
originally produced for its seeds and leaves. Carrots can be classified as hardy biennials and are grown as annuals. Carrots can vary greatly in colour, shape
over the ground. Indeterminate tomato types are so-called ‘tender’ or ‘half-hardy’ perennials. The plants die every year in temperate climate, but in greenhouses
centuries. Since citrus originates from these warmer climates they are not frost hardy. Temperatures not falling below −2 °C (28 °F) are required for successful
other greenhouse crops. The aphid may originate from Asia, where its winter-hardy host plant, the peach tree, is native, however it is now a pest with a world-wide
field. Female Trissolcus wasps can parasitize up to 300 eggs and they are a hardy species that can survive up to 2 weeks without food. Trissolcus feeds on
plants are either herbaceous or woody, while the winter host plants are hardy, woody perennials. Aphids that do not alternate between host plants also
variety of soils up and down California’s central valley. It is a fairly hardy crop that can tolerate hot summers and drought conditions moderately well
