To get your garden to grow the organic way you will have to learn how to feed the soil that you will be planting in.  One thing to remember is that you want to give back to the earth.  These three things will help you in getting your soil ready for planting.  You need compost, manure, and peat moss.  Get the gardening area ready in the spring and you might not have to fertilize at all in the growing season (if you are lucky).  There are some plants and vegetables that will need to get just a little more fertilizer then the others, just do your homework on what you are planting.

One other thing you can use is fish emulsion, which is great for tomatoes, berries, peppers and fruits. Just remember that whatever you feed your garden or plants the weeds will also be using to grow up strong.  You can pull them out by the roots or try some vinegar to hold them at bay.  The weeds need to be taken can of often for the fact that they will be stealing the water and fertilizer away from you garden and they might just kill off your fruits and vegetables.
 
You can bring in fast growing plants between crops in you vegetable garden to improve fertility.  Doing this can suppress weeds as well. Although vegetables usually need to be watered for the best crops, some can give acceptable results with minimal extra watering. But sowing and transplanting are critical times for watering for all crops.

Some leafy vegetables, such as spinach and celery for example, produce more and better quality and are less likely to run to flower if kept moist at all times.

Cabbages, cauliflower and lettuces are similar, but applying 25-litres per sq m 10-20 days before harvest gives good results if water is short. Brussels sprouts benefit from watering when the buttons begin to form.

Flowering legumes and sweet corn respond to two soaks (or every 10 days) when flowering begins and when produce begins to form. Watering at other times promotes foliage without increasing yield. Runner beans, courgettes and cucumbers have a prolonged flowering period and need constant moisture and repeated watering to do well.

Root vegetables are not so needy of water as other crops, but benefit from watering, especially when grown densely.

Onions show little benefit from watering.

Potatoes do best when water is plentiful. But if pressed, concentrate on tuber initiation, usually in May, to boost tuber numbers, and during late summer to limit fluctuations of soil moisture that lead to splitting and secondary tubers.