Both peppers and tomatoes have high requirements for water and nutrients. The soil must stay consistently, slightly moist. As a basic principle, you should always water these vegetables in the early morning or during the evening hours. With tomatoes, above all, make sure not to water the leaves at all, only the base of the plant. Wetting the leaves only encourages attack by mold pathogens. For this reason, it’s ideal to locate the plants in a spot that’s sheltered from rain.