Hi, Well it depends on what kind of seeds you have. Cool-weather vegetables such as lettuce, spinach, broccoli, peas, radishes, onions, potatoes, cauliflower, etc can be put into the garden as soon as the soil can be worked in the spring. They do best in cool weather and can tolerate a surprise late frost. Just make sure your soil is loose and friable and not cold and muddy. Warm-weather vegetables such as tomatoes and peppers need to be started indoors 6 to 8 weeks before the last expected frost in your region We have a frost map on this site if you need clarification on your frost dates. Flowers work the same way. Cool-weather flowers such as calendula and larkspur can be planted at the same time as your spinach. Most other annual flowers however, are warm weather plants that should be planted outdoors after frost danger has passed. This includes marigold, salvia, sunflower, etc. But, to make things a little more confusing, there are warm weather annual flowers that require an early start indoors. This includes, begonias, impatiens, seed geraniums. The very best thing to do is to read the seed pack. Each seed pack should have instructions on proper starting times and methods. If you follow the seed pack instructions, you'll be fine.