Choose the right fertilizer to suit your growing needs, and apply it only in the recommended amounts. Be sure to follow all directions given on the product's label for safe application, storage and disposal. For all the information you need to get started, see the Backyard Magic composting handbook from the New Brunswick Department of the Environment. In The House for some help and inspiration. They may shelter insect pests or contribute to the spread of plant diseases.
Some weeds seem almost impossible to destroy, once they take hold in the lawn or garden.
As always, prevention is the first line of defense. Stop the weeds before they get started. Consult gardening books to identify your weeds. If you know what you're fighting, you can plan a strategy to match. By far, most of our weeds are annuals, which live one season, set seed, and die.