Are aphids good or bad for a garden?

Aphids are generally considered bad for a garden because they feed on plant sap, which can weaken plants and lead to stunted growth or even death. They can also transmit plant diseases and attract other pests, such as ants. However, they can be a food source for beneficial insects like ladybugs and lacewings, which help control their population. Thus, while they have some ecological value, their overall impact on garden health is typically negative.