Leguminous crops Two cultural groups are included in the legumes,--the bean group (including all field, garden, and kidney beans, and the cowpea) comprising warm-weather plants; the pea group (including field and garden pea, the Windsor or Broad bean) comprising cool-weather plants. The former are quickly susceptible to frost and should be planted only after the weather is settled. The latter are among the earliest vegetables to be planted. The leguminous crops are not transplanted, the seed being placed where the plants are to grow.