There's nothing like the taste of homegrown tomatoes. Regular grocery store produce sections have red globe-shaped vegetables that look like tomatoes, but they taste nothing like the real thing grown in your own garden.
The same truth applies to most vegetables in grocery stores that are shipped in from faraway places or other countries. Unless you make regular trips to a farmer's market or roadside vegetable stand, the only way to get that home-grown taste is to plant your own garden at home.
Those substances may make the vegetables look better and last longer, but they can dramatically affect the nutritional value and definitely the taste.
You may think that seaweed would be soggy and difficult to work with, but you only have to rinse it off. Pile it in a stack on your driveway or sidewalk, where the water runoff will not affect your yard or garden. Leave it there for few weeks so the rain will wash it thoroughly and you can add it to your compost heap or into the garden soil in the fall.
Three or four weeks before planting in the spring, simply turn the winter crop over by digging it into the soil. As the plants decompose, they become a fertilizer for the next crop by adding humus to the soil.
If you are careful to mix compost and home-grown organic fertilizers, you will be able to customize your garden beds specifically for the vegetables and flowers you're growing. One of the best things you can do to ensure that your soil is exactly what you want it to be, you can have it tested.
Soil tests are available from a state agricultural university, if there is one in your area, or you can get one from a local Cooperative Extension office. The results of a soil test will tell you exactly what you need to do to fertilize your soil and add whatever trace elements are necessary.