Rotate Crops

Many diseases and soilborne insects that attack plants remain in the soil even after you harvest the crop. They wait there to reinfest susceptible plants. If you plant the same crop or a closely related one in that site a disease or insect will probably attack the new planting. Prevent this needless loss by rotating your crops each year. The practice costs nothing and could save a lot.

Crop rotation requires only a little planning. If you plant tomatoes in one bed this year, then don't plant tomatoes or a related crop in the same bed for the next two years. If possible, it is best to let at least three years pass before planting where the same or related crop grew before.

Integrate and Interplant

It is the nature of disease organisms and pests to take the easiest route. What could be easier than moving down a row of your favorite host plants and attacking one after the other of them? Organic gardeners have known for generations a way to confound many pests, especially those that prefer one particular crop over others, and it doesn't cost a cent.

Interplanting mixing and mingling different species of plants in a garden bordereffectively confounds many types of pests. It slows the progression of diseases when the plant next to an infected one is not susceptible to the disease-causing organism. For pests, the turbulent scene of mixed textures, colors, and odors, jams their plant-seeking radar.

Weed out the Competition

The first line of defense is to kick the competition when it's down. Don't allow weeds to get a foothold. Not only are they unsightly, weeds are real enemies of any gardener. They rob the soil of water and nutrients meant for cultivated plants. Many harbor diseases or serve as alternate hosts for pests. If allowed to grow, they may shade plants from sunlight, block air circulation around foliage, or crowd out crops entirely.

Rather than battle established weeds and the problems they create, get them before they get you. One tactic is to spray a pre-emergent herbicide, which kills weeds before they emerge. Another weed combatant is a heavy, water-permeable fabric that acts as a weed mat, laid out between landscape plants. It physically blocks weeds from sprouting. It's not cheap, but the time and money you save over other forms of fighting weeds may make it a good choice for your garden. A similar tactic is to put down a thick layer of mulch.

Young weeds are easy to scrape away with a hoe. Cultivate carefully around tender, young plants to avoid damaging roots. Use a scuffle hoe or toothed-wheeled weeder to tear out weeds while they are still small. When all else fails, get down on your knees and yank up weeds by their roots. It's good exercise and a well-weeded patch leaves any gardener with a real sense of accomplishment.