Some vegetables are considered heavy feeders and will preform better with an occasional feeding or two during the growing season. Below is a list from the Master Gardener Handbook. The Community Garden provides each gardener with slow acting organic fertilizer each year, eliminating the need for additional feedings, but a water soluble application can gives these plants an additional boost. If you should decide to add additional fertilizer, be certain it is organic!

Cabbage                          Cucumber

Eggplant                          Pumpkin

Summer squash            Winter squash

Tomato

Pruning tomatoes will increase yield and improve air circulation which will help avoid diseases. Removing unwanted shoots and leaves can also be an important part of ensuring that the majority of the nutrients are sent to the fruit, instead of being wasted on unwanted shoots. Ideally sucker shoots can be nipped off while the plants are still small. If you are doing this later in the season leave a couple inches of the "branch", don't cut/pinch right at the main stem. Pinching them off with your fingernails works great and helps eliminate diseases or you can disinfect your shears. Remove all stems below the flower producing branches. At the end of the summer you can "top" the plant to get the last growth of the season.