Experienced gardeners advise against planting snap peas after late April because peas do not develop properly in warm weather. This year, however, the weather was unusually cool into late June, and ttherefore the fact that these snap peas were planted in mid-May is unlikely to result in crop failure despite the experts' warnings.
The pattern of reasoning displayed above is most closely paralleled in the statement 'Where flowers are to be planted under shade trees, gardening experts often advise using impatiens since impatiens does well in conditions of shade; however, it is unlikely to do well under maple trees since maple tree roots are so near the surface that they absorb all available moisture.'